Sandra Birchmore and Matthew Farwell: Federal Murder Trial, Opening Statements and Evidence Questions

Official Massachusetts POST record: On March 21, 2024, Matthew Farwell entered a voluntary decertification agreement. The POST Commission says he agreed that allegations involving sexual contact with a 15-year-old Stoughton Police Explorer when he was 27, continued sexual encounters and untruthfulness during a death investigation were sufficient to support revocation of his certification. This agreement was not a guilty plea to the federal murder charges. Read the POST Commission’s official record and linked documents.

The Stoughton internal investigation also addressed William Farwell, Matthew’s twin brother, and former deputy chief Robert Devine. Its conclusions about workplace misconduct and untruthfulness should not be conflated with the elements the federal prosecution must prove at trial. The fact that Farwell moved from participant to instructor in the same youth program raises questions about oversight and professional boundaries, but does not itself establish criminal guilt.

Primary sources: United States’ August 2024 detention motion (Document 9); Massachusetts POST Commission decertification record.

Primary records: March 21, 2024 POST decertification agreement and order

Source-document update, October 11, 2026. Two official Massachusetts Peace Officer Standards and Training (POST) Commission records clarify the legal status of Matthew Farwell’s police certification: the four-page Voluntary Decertification Agreement and the one-page Decertification Order, Commission Adjudicatory Case No. 2023-011-S (PI-2022-11-22-003).

The agreement recites allegations that Farwell, a Stoughton officer from March 2012 until April 1, 2022, had a sexual relationship with a Stoughton Police Explorer beginning in 2013 when she was 15 and he was 27, and was untruthful about the extent of that relationship during the Massachusetts State Police death investigation. It states that Stoughton Police sustained administrative allegations in August 2022 concerning conduct unbecoming, incompetence, untruthfulness and lack of proper attention to duty. The Commission denied his recertification application on October 10, 2022.

Critical legal qualification: Paragraphs 16–19 expressly say Farwell agreed to permanent decertification without admitting the truth of the allegations and waived administrative challenges. This was an administrative resolution, not a guilty plea or a verdict in the federal criminal case.

In its March 21, 2024 order, the POST Commission permanently revoked Farwell’s Massachusetts law-enforcement certification, prohibited him from seeking or holding employment in any capacity at a Massachusetts law-enforcement agency, barred admission to police academies, and directed reporting to the National Decertification Index. The agreement and order should be read together: the agreement describes allegations and waiver terms, while the order establishes the binding certification consequences.

Official source records: Massachusetts POST Commission — Matthew Farwell public disciplinary record (Voluntary Decertification Agreement, four pages; Decertification Order, one page).

Government / prosecution: complete October 12 amended roster (67 names)

The table transcribes all three supplied witness-list pages. Affiliations are shown only where the filing supplies them. Blank affiliation fields do not establish a witness’s occupation or relationship to the case. Names follow the spelling shown in the filing.

Primary source: Government’s First Amended Witness List, United States v. Matthew Farwell, Criminal No. 24-CR-10259-DJC, dated October 12, 2026; reviewed from the supplied three-page copy. A docket entry number is not visible on these pages. This is a proposed-witness roster, not a testimony log.

Defense: identified potential witnesses

Important: Angela Farwell and possibly other witnesses may appear on both lists; the categories are not mutually exclusive. Inclusion on a witness list does not mean the person testified, endorsed that party’s theory, or was charged with any crime. The previously reported 134-name deduplicated total refers to the September lists (dockets 259 and 260), not a recomputed total using the October 12 amendment. The prior reported government count was 68; the supplied amended list has 67. Without a complete comparison of the original and amended rosters, this update does not identify particular additions or removals.

Sources: WCVB, names to know; WCVB, witness lists; Court docket tracker and witness-list counts.

Autopsy findings cited in the 2024 FBI affidavit: a fracture of the right side of the hyoid bone, conjunctival petechial hemorrhages, and hemorrhage involving the left sternothyroid muscle. These findings require interpretation in conjunction with ligature position, suspension mechanics, scene reconstruction, and all available medical evidence. No isolated injury proves murder or suicide.

Expert disagreement: Federal prosecutors intend to rely on forensic experts William Smock and Michael Baden, who interpret aspects of the injuries and scene as supporting strangulation. Defense expert Thomas Andrew has reportedly stated that the manner of death cannot be determined from the available findings and that suicidal hanging cannot be excluded. The defense also points to the original medical examiner determination, mental-health evidence and the absence of signs of struggle. These are disputed expert interpretations for the jury to assess.

October 9, 2026 openings: Prosecutors cited surveillance, electronic communications and DNA evidence concerning the strap; the defense maintained that Birchmore died by suicide. Opening statements are arguments, not evidence or findings. Sources: WBUR, October 6; Boston 25 News, October 9; FBI affidavit, docket 9-1, paragraph 81.

Defense attorney Kimberly Stevens argued in October 9 opening statements that Birchmore had received psychiatric treatment since childhood, had attempted suicide in her early teens, and experienced emotional, financial and pregnancy-related stress near her death. Counsel pointed to text messages describing insomnia and distress, a February 1 search for the color of a suicide-awareness ribbon, and an online image referring to death and grief. Earlier defense submissions also referred to treatment shortly before death and medication with a suicide-related warning, without publicly identifying the drug. These are defense representations; the underlying clinical records and full search context are necessary to assess them.

Prosecutors dispute the inference of suicide. They argue that the ribbon search related to identifying a cause represented by a display, and emphasize Birchmore’s preparations for motherhood: buying baby supplies, discussing a baby shower, making future appointments and submitting a community-college application. Future planning does not categorically exclude suicide, just as previous suicidal behavior does not establish that a particular death was suicide.

Outstanding clinical-record questions: What was Birchmore’s actual diagnosis, if any? Was there a documented suicide-risk assessment close to February 1? What medication, dose and treatment dates are supported by records? Did any involuntary hospitalization occur, and when? Published accounts conflict on these issues. A third-party chronology describes a January 31 therapist screening without suicidal ideation, but that claim should not be treated as established until supported by a clinical record or testimony.

Critical evidentiary distinction: The initial medical examiner’s classification of suicide was officially amended in April 2026 to undetermined. Neither the defense’s history-based theory nor the prosecution’s future-planning evidence alone determines manner of death. Farwell has pleaded not guilty and is presumed innocent.

Sources: Boston.com, October 9 openings; Boston Globe, April 28 pretrial arguments; NBC Boston, prosecution trial brief; Boston.com, medical examiner amendment.

January 20 police contact: Prosecutors told jurors that Birchmore’s friend called Stoughton Police over an alleged $248 debt for cosmetic nail strips. The dispatcher reportedly explained that the dispute was civil, after which the caller disclosed Birchmore’s sexual relationship with Matthew Farwell. Prosecutors say the dispatcher told Farwell, and Farwell instructed the colleague not to discuss it. The contemporaneous call record, dispatch log and any messages between Farwell and the dispatcher are necessary to verify the sequence and determine whether any formal safeguarding response followed.

Uncollected broken necklace: Reporting on federal filings describes a flamingo pendant necklace with a broken chain visible in photographs of Birchmore’s apartment. Investigators reportedly did not collect it at the original scene; a relative later turned it over. The significance of the breakage and any chain-of-custody implications remain matters for evidence and expert testimony, not assumptions of a struggle.

Original investigative limitations: Federal prosecutors criticized the initial state investigation, including a reportedly unrecorded Farwell interview and the absence of search warrants for his home and devices. The initial suicide classification was subsequently changed to undetermined; that revision does not itself establish homicide.

Competing opening statements: The prosecution characterized the surveillance, digital records and DNA evidence as consistent with homicide staged as suicide. The defense cited Birchmore’s psychiatric history, stress, internet activity, original autopsy conclusion and asserted absence of struggle evidence. Neither side’s opening statement is testimony.

Sources: Boston Globe, October 9, 2026 trial coverage; Boston Globe, October 1, 2026 case background; Town of Canton, April 1, 2025 police audit.

The Town of Canton’s official report states that Canton detectives and Massachusetts State Police reviewed apartment-complex video and identified Matthew Farwell arriving on February 1, 2021 at approximately 9:27 p.m. and departing at approximately 9:56 p.m.. These timestamps supersede the 9:43 p.m. departure time previously cited in this article. The full video, original timestamps and clock calibration remain important for forensic reconstruction.

According to the report, on February 6 Canton detectives interviewed one witness who described Birchmore’s relationship with a police officer and alleged paternity, and another who relayed a claim that the boyfriend had threatened to address the pregnancy if Birchmore did not obtain an abortion. These were statements reported to investigators, not judicial findings that the alleged threats occurred. The report also describes Canton officers securing the death scene pending detective response.

Previously documented police interview and digital-evidence questions

Contemporaneous State Police interview notes reported by the Boston Globe say Farwell told investigators he visited Birchmore on February 1 to end their relationship, that she was upset but made no suicidal statements, and that he had deleted their communications. This account is significant because defense counsel now argues that Birchmore died by suicide following the breakup. It does not alone resolve manner of death. Investigators reportedly recovered approximately 12 months of communications from Birchmore’s laptop; obtaining the original extraction report and complete messages is critical to testing both sides’ accounts. Boston Globe, April 13, 2022.

October 9 opening-statement detail: The prosecution described a January 20, 2021 call to the Stoughton Police Department about the relationship. A Boston Globe live account says the recipient was a dispatcher who reportedly told Farwell about the call. The dispatcher’s identity and underlying dispatch records should be checked before assigning personal responsibility. Prosecutors also described a final February 1 text exchange around 9:07–9:10 p.m. in which Farwell asked to visit and Birchmore said he could come by. Opening statements are attorney representations, not testimony. Boston Globe, October 9, 2026.

Farwell denies the federal allegations and is presumed innocent. The original manner-of-death classification of suicide was amended to undetermined; this is not a homicide ruling.

What the ligature DNA actually establishes remains disputed

Prosecutors told jurors that DNA evidence connects Matthew Farwell to the strap around Sandra Birchmore’s neck. Defense attorney Kimberly Stevens disputed the strength of that characterization: she said the sample contained DNA from multiple contributors and that Farwell was not excluded, rather than conclusively identified as a contributor. These are materially different evidentiary propositions. A non-exclusion from a mixed profile does not by itself establish that a person’s DNA was deposited during a homicide. The complete laboratory report, statistical weight of the mixture, substrate location, contamination controls and chain of custody are necessary for a fair assessment. Boston Globe, October 9, 2026 trial coverage.

Phone-search consent dispute

Before opening statements, the parties disputed how the jury should understand Farwell’s consent to a police search of his phone. The defense noted that the written consent form described the death as a suicide. Prosecutors said that characterization was misleading because Farwell verbally restricted consent to communications with Birchmore. The legal and factual scope of consent should be evaluated from the signed form, officers’ testimony and any contemporaneous recordings or notes, rather than assuming he consented to a comprehensive forensic search. Boston Globe trial live report.

Forensic experts and what jurors can hear

Pretrial rulings reportedly permit prosecution experts Dr. William Smock and Dr. Michael Baden to offer opinions that Birchmore was strangled, while the defense challenges those opinions and the retrospective reconstruction. Other rulings concern Birchmore’s journals and statements, including a forfeiture-by-wrongdoing analysis. Admission of an out-of-court statement for trial purposes is not a jury finding that the defendant committed murder. The actual orders and expert reports should control over summaries of the rulings. Docket-linked case chronology.

At October 9 adjournment, no trial witness had testified. The jury is expected to return Tuesday, October 13. Farwell has pleaded not guilty and is presumed innocent.

Birchmore’s laptop: Defense counsel reportedly told the court that a Massachusetts State Police forensic server failed on August 24, 2024, resulting in loss of the raw forensic data extracted from Birchmore’s laptop. A PDF extraction/report reportedly survived. The laptop held thousands of messages between Birchmore and Farwell. A PDF report is not necessarily equivalent to the raw forensic image: metadata, deleted artifacts, validation and independent reanalysis may differ. The defense contends the loss could affect its ability to test evidence; prosecutors had not yet publicly established the full consequences in the reporting reviewed. Pretrial report citing MassLive courtroom coverage.

Farwell’s phone: A late pretrial dispute over the scope of his 2021 search consent led prosecutors to conduct a further review of the device shortly before trial. According to reporting about an October 3 prosecution filing, prosecutors said the renewed examination identified potentially incriminating evidence despite alleged deletion efforts; the precise material was not publicly described in that report. The defense disputes how the original consent should be characterized. The filing, signed consent form, warrant/authorization records, privilege-filter process and forensic logs are needed before assessing either side’s interpretation. October 5 trial-eve analysis.

Pre-death apartment access: The Justice Department’s August 2024 charging announcement alleges that approximately one week before Birchmore died, Farwell asked her for a spare apartment key and requested secrecy, and looked through her closets and bathroom during an earlier visit. These are federal allegations, not established trial facts. They warrant comparison against apartment access logs, surveillance, messages and testimony, particularly because the prosecution alleges the scene was staged. U.S. Department of Justice, August 29, 2024.

Editorial caution: Loss of raw data does not by itself prove evidence was intentionally destroyed, and a prosecution characterization of newly found evidence is not a judicial finding of guilt. Farwell has pleaded not guilty and is presumed innocent.

Judge Denise Casper denied defense motions seeking to exclude certain testimony from Sandra Birchmore’s treating mental-health counselor and OB/GYN, as well as lay witnesses who reportedly expressed surprise at the original suicide determination. The court distinguished the witnesses’ descriptions of their own reactions and subsequent actions from opinions establishing the medical cause or manner of death. Prosecutors represented that they would not present the treating clinicians as cause-of-death experts merely because of their professional credentials. The defense remains free to challenge those witnesses on cross-examination.

This ruling matters because the defense emphasizes Birchmore’s prior psychiatric history while prosecutors emphasize her pregnancy-related planning. A prior suicide attempt or treatment history does not by itself establish suicidal intent in February 2021; similarly, making future plans does not clinically exclude suicide. The most useful evidence will be contemporaneous assessments, complete treatment records and testimony within each clinician’s actual scope of knowledge.

Key pretrial motions: Defense motion D. 192 concerned treating-provider testimony; D. 193 concerned lay testimony about the suicide determination. Both were denied. The court also barred an FBI agent’s dramatized audio narration of text messages under D. 220, meaning jurors are expected to read the messages themselves. The defense’s challenge to digital expert Daniel Loper was still under advisement in the September 17 docket summary; a subsequent order should be checked before reporting a final ruling.

Source: September 22 docket-based review of Judge Casper’s rulings; Boston Globe, October 9 trial coverage. Farwell has pleaded not guilty and is presumed innocent.

Paternity distinction: Birchmore reportedly believed Farwell was the father of her unborn child. Subsequent DNA testing reportedly excluded Farwell as the biological father. That distinction must be retained throughout the investigation: her belief at the time is relevant to the chronology, but it is not biological proof of paternity.

Federal legal theory: The witness/victim-killing count under 18 U.S.C. §1512(a)(1)(C) requires proof beyond a reasonable doubt of a killing intended to prevent communication about a federal offense. The alleged underlying offenses (coercion and enticement, deprivation of rights under color of law, and wire fraud) are part of the prosecution’s theory; the original indictment did not separately charge Farwell with those offenses. A later superseding indictment added a count involving the unborn child.

Evidence disputes: Prosecutors referenced a final text exchange, apartment surveillance, alleged electronic communications and forensic evidence. The defense disputed the homicide theory, referenced Birchmore’s mental-health history, and argued that evidence under her fingernails did not identify Farwell. These are positions presented to the jury, not judicial findings. After openings, lawyers raised objections concerning Instagram-data timing, the significance of Farwell wearing a mask, and DNA characterizations; the judge reportedly denied most objections and considered a question about references to other affairs.

Sources: Boston Globe, October 9 trial coverage; Boston.com, October 9; WBUR, October 6.

Motion for bill of particulars: In a separate pretrial order, the court denied Farwell’s request for additional specificity about the federal nexus of the charges. The court noted that the defense reported receiving more than 286,000 pages of discovery, over 43 hours of audio and video evidence, and more than 750,000 pages of digital extraction reports. The court found the superseding indictment and disclosures sufficiently informed Farwell of the accusations; the ruling did not determine whether the accusations were true. Read the court ruling.

First witnesses expected October 13: The prosecution previewed testimony from Stoughton Detective Heather Cheever, school administrator Cheryl Carlson, two apartment-building employees, Canton Police Officer Ensley Cotard and Massachusetts State Police Trooper Matthew Dunne. The latter two were among the initial responding officers who discovered Birchmore’s body. This is an anticipated witness lineup reported October 9, not confirmation of testimony already delivered. Boston Globe trial reporting, October 9.

After the 16-person jury was excused on Friday, lawyers returned to argue about how certain points had been characterized in their opening statements. The disputes included the timing of Instagram data, why Farwell was wearing a mask on the night of Birchmore’s death, and whether the DNA evidence was described with appropriate precision. The judge generally denied the objections but considered whether the defense’s claim that Farwell wore the mask to conceal an affair might open the door to evidence of other alleged affairs. A question under consideration is not a final ruling; the court’s written orders or transcript should be obtained before describing a definitive outcome.

The defense emphasized that the ligature sample contained DNA from several contributors and that Farwell was not excluded, rather than conclusively identified as the contributor. The prosecution characterized DNA as linking him to the strap. Neither counsel’s characterization substitutes for the underlying laboratory statistics. The defense also argued that Farwell’s DNA was not found beneath Birchmore’s fingernails, but absence of recoverable fingernail DNA cannot alone establish that no assault occurred.

Judge Denise Casper expressly instructed jurors that opening statements are not evidence and to keep an open mind. The panel consists of 16 people, including alternates; witness testimony was expected to start Tuesday, October 13, following the Monday holiday.

Why the federal charge requires more than resolving manner of death

The principal federal count is killing a witness or victim under 18 U.S.C. § 1512(a)(1)(C), not a generic state murder charge. Prosecutors must prove beyond a reasonable doubt that Farwell killed Birchmore with the requisite purpose of preventing a communication to law enforcement about the commission or possible commission of a federal offense, including the necessary federal nexus. A second count alleges causing the death of a child in utero. The prosecution does not have to prove Farwell was the biological father; published DNA testing reportedly excluded him as the father. These are charges and legal elements, not findings of guilt.

Sources: Boston Globe live courtroom reporting, October 9; Boston.com federal-charge explainer, September 29; WCVB September 17 evidentiary rulings.

October 9, 2026: The federal jury was seated and both sides gave opening statements. Prosecutors described the final reported text exchange, including Farwell’s request to visit and Birchmore’s response welcoming him. The defense challenged the homicide theory and highlighted evidence it contends supports suicide. These are opposing positions, not jury findings. Boston Globe courtroom report.

Next scheduled proceedings: Boston.com reported on October 9 that trial proceedings would continue Tuesday, October 13. Confirm any subsequent schedule change with the court before treating this as a live calendar entry. Boston.com opening-statement coverage.

Who initiated the psychiatric evaluation?

According to the Boston Globe’s March 1, 2024 investigation, civil-court filings disclosed that Stoughton police used their authority to seek a psychiatric evaluation for Birchmore. The disclosure arose in filings involving former animal control officer Joshua Heal. Crucially, the published records do not identify when the intervention occurred, which officers participated, or what prompted it. The existence of a police request does not establish that a clinician diagnosed a particular illness, that an involuntary admission actually occurred, or that Birchmore was suicidal when she died. Those questions require the underlying application, emergency-department and psychiatric records, and any corresponding police reports.

What the October 9 openings added

Prosecutor Torey Cummings argued that on Birchmore’s final day she was arranging a baby shower, paid for an entrance examination related to nursing education, and exchanged hundreds of messages. The government also alleged that investigators initially failed to check Farwell’s account and that he had time to delete relevant messages. Defense attorney Kimberly Stevens countered with Birchmore’s prior suicidal behavior, messages describing stress and insomnia, an internet search about a suicide-awareness ribbon, and an online image referencing death and grief. These are competing interpretations of digital and contextual evidence, not findings by the jury.

Further reading: Boston.com, October 9, 2026, opening statements; Boston 25 News, October 9 trial report; 2022 Stoughton internal affairs report.

Reported January warning to Stoughton Police

A friend of Sandra Birchmore reportedly told investigators that in January 2021 she alerted a Stoughton police employee about Birchmore’s relationship with Matthew Farwell. According to the Boston Globe’s account of investigative records, that communication reached Farwell, who then challenged Birchmore about another person knowing of the relationship. This is potentially important evidence of knowledge and motive, but the record still needs to establish precisely which employee received the report, how it was transmitted, and whether any safeguarding or internal-affairs action followed. Source: Boston Globe, September 1, 2024.

Reported February 1, 2021 timeline

These details were described in reporting on the FBI affidavit and interviews; they are not independently validated forensic conclusions. Boston Globe investigative reconstruction.

Ligature DNA and forensic interpretation

During October 9, 2026 openings, prosecutors characterized DNA evidence on the ligature as linking Farwell to the item. Defense counsel disputed the prosecution’s homicide reconstruction, citing the original medical examiner’s suicide determination and asserted lack of struggle evidence. The laboratory’s underlying analytical report, profile comparisons, mixture interpretation, collection documentation and transfer possibilities must be examined before any conclusion about how or when DNA was deposited. Boston 25 News, October 9, 2026.

Documents to obtain next: original January contact/dispatch or departmental records; Farwell-Birchmore communications in complete chronological context; original CCTV files and clock calibration; mobile device extraction and Snapchat records; ligature DNA reports and chain-of-custody documentation. No jury finding of guilt has been made, and Farwell is presumed innocent.

At the time of that report, Birchmore’s death was described as suicide, consistent with the original medical examiner determination. Federal prosecutors later alleged Matthew Farwell killed Birchmore and staged the scene to resemble suicide. The change in investigative theory should be preserved in the case chronology. The CBS article does not establish that William Farwell or Robert Devine were charged with Birchmore’s killing.

Source: CBS Boston, September 23, 2022 — Stoughton Police investigation.

A subsequent federal indictment added an allegation concerning the death of Birchmore’s unborn child under 18 U.S.C. §1841. Read the DOJ superseding-charge announcement. Farwell has pleaded not guilty and is presumed innocent.

The judge found that counsel for the plaintiff had submitted fictitious case citations, attributed by counsel to an unidentified AI system used in preparing the legal briefs. Although the judge credited counsel’s explanation that the errors were not intentional, the court ordered counsel personally to pay a $2,000 sanction for failing to verify authorities before filing. The ruling concerns attorney conduct and citation accuracy; it is not a finding on the merits of the wrongful-death claims, nor a sanction against Birchmore’s estate. Source: Findings, Rulings and Order Imposing Sanction, February 12, 2024, pp. 1–3, 14–16 (uploaded primary court order).

Government detention motion (August 28, 2024; docket 9): Prosecutors argued that Farwell posed a flight risk, a danger to the community and a risk of obstruction. The filing discusses alleged electronic evidence deletion, duty-time discrepancies, the Police Explorers program, and reported conduct in January–February 2021. Its assertions are advocacy submitted in support of pretrial detention.

FBI Special Agent Chenee Castruita affidavit (August 28, 2024; docket 9-1, 45 pages): The affidavit details the FBI investigation, including messages recovered from phones and a laptop, witness interviews, surveillance evidence, and competing interpretations of the death scene. The agent expressly states that the affidavit does not contain everything known to investigators. It should not be treated as a complete evidence inventory.

Document-control note: Two uploaded copies of the four-page original indictment appear identical. They are one source, not two independent corroborations. The uploaded documents are the 2024 charging and detention materials; later superseding charges and trial testimony must be tracked separately. The original documents are accessible through the U.S. Attorney’s Office release.

Important clinical and evidentiary distinction: The reported police-initiated psychiatric evaluation is not proof of a particular diagnosis, suicidal intent or the cause of death. Likewise, inability to locate safeguarding-training documents does not prove training never happened. The key question is what contemporaneous records show.

Primary and investigative sources: Stoughton Police internal affairs findings (2022 PDF); The Marshall Project investigation (August 2024); Boston Globe reporting (March 2024); GBH coverage of internal affairs findings.