← Back to United States casesSandra Birchmore, Denise Birchmore, and others Allegedly Murdered by Matthew Favel, Robert Divine, and others, Massachusetts, United States
Case Summary
Sandra Birchmore, a young woman from Massachusetts, was found dead in her apartment while three months pregnant. She had been in a nearly decade-long illegal relationship with police officer Matthew Favel, who allegedly abused his authority to manipulate and sexually exploit her starting when she was a minor. After Sandra became pregnant and pressured Matthew to acknowledge paternity, tensions escalated. On February 1, 2021, Matthew visited Sandra's apartment, and shortly after, she was found dead by hanging. Initial police reports suggested suicide, but further investigation revealed signs inconsistent with suicide, leading to Matthew being charged with murder and staging the scene. The case also exposed other men accused of abusing Sandra when she was a minor. Matthew remains in pre-trial detention, facing possible death penalty if convicted.
Basic Information
Country: United States
State/Province: Massachusetts, United States
City/Region:
Incident Type: Murder
Relationship Status: Extramarital relationship
Relationship Duration: Approximately 9 years
Affair / New-Partner Context
Recorded context: New relationship started
Reported initiator: Victim
Relationship timing: During marriage or ongoing partnership, before separation
Incident Date: Feb. 1, 2021
Incident Sequence and Additional Victims
Primary reported outcome: Homicide
Reported self-harm outcome: No suicide or attempt reported
Reported sequence: Order not reported / unclear
Additional victims reported: 1
Additional victim events:
- Unborn child of Sandra Birchmore — Child; Killed; Same episode; order unclear
Relationship Journey
Relationship Origins:
- Met at Workplace
- Met during travel
Relationship Stages:
- Dating
- Living Together without Marriage
Analysis
Contributing Factors:
- Cheating / Infidelity
- Domestic Violence Allegation
- Domestic Conflict
- Family pressure
Red Flags:
- Escalation Pattern / Violence
- Secret affair
- Manipulative behavior
- Secret phone communication
- Threats
- Firearm Access / Concerning Weapon Behavior
- Divorce Pending / Recent Separation
Motives:
- Revenge
- Jealousy
- Control/domination
- Fear of exposure
- Eliminate romantic partner
Relationship Outcomes:
- Legal case ongoing
- Homicide before divorce
- Arrest made
- Investigation still ongoing
- Deadbody recovery
People Link Graph
Relationship Journey Graph
Origin
- Met at Workplace
- Met during travel
How the relationship or connection began.
Status
- Extramarital relationship
Approximately 9 years
Stages
- Dating
- Living Together without Marriage
Important relationship phases recorded for this case.
Warning Signals
- Escalation Pattern / Violence
- Secret affair
- Manipulative behavior
- Secret phone communication
- Threats
- Firearm Access / Concerning Weapon Behavior
- Divorce Pending / Recent Separation
Reported red flags or early concern points.
Pressure Points
- Cheating / Infidelity
- Domestic Violence Allegation
- Domestic Conflict
- Family pressure
- Revenge
- Jealousy
- Control/domination
- Fear of exposure
- Eliminate romantic partner
Contributing factors and possible motives from the available sources.
Incident
2021-02-01
Outcome
- Legal case ongoing
- Homicide before divorce
- Arrest made
- Investigation still ongoing
- Deadbody recovery
Recorded relationship or case outcome.
Sources
English labels are shown first. Original-language titles are preserved for source verification.
Sandra Birchmore, Denise Birchmore, and others Allegedly Murdered by Matthew Favel, Robert Divine, and others, Massachusetts, United States
Lucia Leona · Original language: English
View original title
Polizist ermordet seine Affäre? | Der Fall Sandra Birchmore
AI Intelligence Assessment
Relationship Pattern
Coercive Control
Pattern Analysis
The case involves a long-term coercive control and manipulation by a police officer over a vulnerable minor, exploiting his authority to maintain an illegal and abusive relationship. The perpetrator isolated the victim, controlled her behavior, and used threats and sexual violence. The relationship was extramarital and involved deception and abuse of power, culminating in the victim's murder to silence her.
Investigative Notes
Initial police findings suggested suicide, but activists and FBI investigators reopened the case due to inconsistencies. Evidence includes chat histories, surveillance videos, and forensic findings. Matthew Favel was arrested and charged with murder and staging the crime scene. Other suspects were identified but not arrested. The case remains under legal proceedings.
Investigation Confusion
Initial classification as suicide was disputed due to forensic evidence and activist pressure. Conflicting claims about paternity and other sexual partners complicated the narrative. No arrest warrants issued for other accused men despite allegations.
Case Reconstruction / Puzzle Pieces
Sandra's troubled childhood led her to seek recognition from adults, especially police officers. She entered the Police Explorers program where Matthew Favel groomed and abused her starting as a minor. The illegal relationship lasted nearly a decade alongside Matthew's marriage. Sandra became pregnant, escalating conflict. On February 1, 2021, Matthew visited Sandra; shortly after, she was found dead by hanging. Forensic and digital evidence contradicted suicide, leading to murder charges against Matthew.
Risk Assessment
High risk due to prolonged abuse, manipulation, power imbalance, and escalation to lethal violence. The perpetrator's position of authority and control increased victim vulnerability.
Key Takeaways
Long-term grooming and coercive control by authority figures can lead to fatal outcomes. Early intervention in abusive mentorship programs is critical. Digital evidence and activist involvement can be pivotal in reopening closed cases. Victims may be isolated and manipulated, masking abuse.
AI Case Q&A
What early signals mattered most?
Early signals included Sandra's isolation, seeking adult recognition, and Matthew's manipulative behavior and control over her communications and movements.
Which clues helped connect the case?
Chat histories revealing abuse and control, surveillance footage of Matthew at Sandra's apartment, forensic evidence of struggle including torn necklace and hair tuft.
Which evidence types appeared strongest?
Strongest evidence included digital chat logs, surveillance videos, forensic crime scene photos, and witness reports from family and friends.
Witness / Eyewitness Statements
Sandra's aunt first raised suspicion about Matthew. A friend reported the relationship to police. School staff requested wellness check due to Sandra's absence. No direct eyewitness accounts of the incident reported.
How did follow-up reports change the understanding?
Follow-up investigations overturned initial suicide ruling, leading to murder charges. Additional suspects were identified but not arrested. The case remains open with ongoing legal proceedings.
What remained unclear?
Uncertainty remains about involvement of other accused men and full extent of abuse. Final verdict on Matthew's guilt and sentencing is pending.