An ex-Massachusetts cop accused of "staging" pregnant lover Sandra Birchmore's suicide bragged that he "would've f---ed" her at an even younger age, according to a disturbing, newly-released arrest affidavit.
On Wednesday, former Stoughton Police Det. Matthew Farwell, 38, pleaded not guilty in the murder of Birchmore, 23, who he allegedly first started to have sexual relations with when she was 15 years old, according to prosecutors.
Birchmore was three months pregnant with Farwell's child when she was found hanging in her Canton, Massachusetts, apartment in February 2021.
A state medical examiner determined she died by suicide, but an independent medical examiner hired by Birchmore's family earlier this year ruled her death homicide by strangulation, citing the scope of her wounds and the positioning of a ligature in his determination.
In the newly-released affidavit, prosecutors alleged Farwell was motivated to kill Birchmore, in part, to keep her from accusing him of coercion, enticement, and wire fraud, the affidavit read. Her death was purportedly the culmination of a years-long pattern of abuse, said prosecutors.
Through the investigation, authorities allegedly uncovered a series of disturbing text messages between the suspect and victim, including one exchange in which Farwell allegedly admitted to Birchmore, "I absolutely would've f----d you" in 2012, a year before she turned 15.
The text messages also revealed alleged conversations between the pair discussing Farwell taking Birchmore's virginity as a teen, as well as her threats toward Farwell to impregnate her if he wanted her to continue to keep their affair a secret from his wife.
Farwell was the last known person to see Birchmore alive when he was captured on surveillance footage entering and leaving her apartment three days before she was found dead in 2021.
Wearing a medical face mask, "he killed her and staged her body and apartment to make it appear that Birchmore had died by suicide," the affidavit read.
