Sandra Birchmore, Denise Birchmore, and others Allegedly Murdered by Matthew Favel, Robert Divine, and others, Massachusetts, United States
This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.
This case illustrates a prolonged pattern of grooming, coercive control, and abuse by an authority figure over a vulnerable minor, culminating in fatal violence. The victim's early life neglect and social isolation increased her vulnerability, while the perpetrator exploited his position to manipulate and dominate her.
The relationship was characterized by grooming, manipulation, and coercive control by Matthew over Sandra, who sought recognition and belonging. Matthew maintained a double life, abusing Sandra while married with children. The victim's increasing demands and pregnancy escalated conflict, leading to lethal violence.
The pathway began with grooming and abuse during Sandra's adolescence, followed by years of coercive control and sexual violence. Pregnancy intensified tensions, and the perpetrator ultimately resorted to murder to silence the victim and conceal his crimes.
Each entry separates the reported behavior or state from the analytical strength of the available narration.
| Behavior / construct | Person / subject | Detailed case context | Evidence |
|---|---|---|---|
| Dependency or attachment insecurity Attachment-related behavior | Sandra Birchmore VictimVictim |
Sandra's difficult upbringing and bullying led her to seek validation from adults, particularly authority figures, making her vulnerable to grooming. Context or trigger: Early childhood neglect and social isolation Reported expression: Seeking adult recognition and approval, especially from police officers |
Narrative-supported psychological state Confidence: High |
| Coercive control Control dynamics | Matthew Favel SuspectHired Suspect/Offender |
Matthew exerted control through sexual violence and surveillance, ensuring Sandra's dependency and compliance. Context or trigger: Ongoing illegal relationship Reported expression: Sexualized violence, monitoring phone location, punishing Sandra |
Explicitly reported Confidence: High |
| Jealousy Emotional state | Matthew Favel SuspectHired Suspect/Offender |
Matthew's reaction to Sandra's pregnancy and pressure to acknowledge paternity included anger and threats, escalating conflict. Context or trigger: Sandra's pregnancy and demands Reported expression: Hostility and threats towards Sandra |
Explicitly reported Confidence: High |
| Emotional escalation Escalation | Sandra Birchmore and Matthew Favel |
The final meeting involved a heated argument, after which Sandra was found dead, indicating escalation from conflict to lethal outcome. Context or trigger: Final confrontation on February 1, 2021 Reported expression: Argument and rapid escalation leading to fatal violence |
Explicitly reported Confidence: High |
| Help-seeking or disclosure Coping response | Sandra Birchmore VictimVictim |
Sandra attempted to assert control by threatening exposure and demanding recognition, indicating a shift in power dynamics. Context or trigger: Pregnancy and threats to expose affair Reported expression: Threatening to make affair public and demanding paternity acknowledgment |
Explicitly reported Confidence: Moderate |
| Instrumental aggression Offender behavior | Matthew Favel SuspectHired Suspect/Offender |
Matthew allegedly murdered Sandra to prevent loss of control and exposure, staging the scene to appear as suicide. Context or trigger: Murder of Sandra Reported expression: Killing to silence victim and cover tracks |
Narrative-supported psychological state Confidence: High |
Select a stage to expand it; scroll horizontally to follow the full sequence.
Sandra's childhood neglect and social exclusion created emotional vulnerability and a strong need for adult approval.
Matthew used his authority to build trust and isolate Sandra, initiating an illegal and abusive relationship.
Matthew maintained control through sexual violence, monitoring, and punishment, ensuring Sandra's dependency.
Sandra's pregnancy and demands for paternity acknowledgment escalated conflict and hostility.
A final argument led to Matthew allegedly murdering Sandra and staging the scene as suicide.
Matthew allegedly staged the crime scene to mislead investigators and avoid detection.
Arrows show the sequence described in the source narrative; they do not prove that one psychological state caused the next event.
Analysis is limited by reliance on reported facts without clinical diagnoses. Some allegations remain unproven, and the full extent of abuse by other suspects is unclear. Psychological constructs are inferred from narrative descriptions.