Peter McMahon, aged 68, died from cardiac arrhythmia after being strangled and having his eyes gouged out. He was in a relationship with Sharon Swinhoe, who, along with Joseph Collins, was charged and found guilty of his murder and perverting the course of justice. The murder allegedly took place at Swinhoe's home in October 2012. The body was transported in a suitcase and stored in a chest freezer. Ronald Douglas admitted to helping move the body and pleaded guilty to perverting the course of justice. Swinhoe made multiple withdrawals from McMahon's bank account. Both Swinhoe and Collins received life sentences, with minimum terms of 25 and 20 years respectively.
Country: England
State/Province: None
City/Region: Durham
Incident Type: Murder
Relationship Status: Dating
Relationship Duration:
Incident Date: Oct. 18, 2012
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How the relationship or connection began.
Important relationship phases recorded for this case.
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Contributing factors and possible motives from the available sources.
2012-10-18
Recorded relationship or case outcome.
English labels are shown first. Original-language titles are preserved for source verification.
They Walk Among Us | UK True Crime · Original language: English
Murder of Peter McMahon involving Joseph Collins and Sharon Swinhoe
Domestic Violence
The case involves a domestic violence pattern where a romantic partner was allegedly eliminated. Financial exploitation is indicated by multiple withdrawals from the victim's bank account. The murder was followed by attempts to conceal the crime, including moving and freezing the body.
Ronald Douglas pleaded guilty to perverting the course of justice for assisting in moving the body. Ann Huxley's testimony about Swinhoe's conflicting accounts was pivotal in the conviction of Swinhoe and Collins. Both offenders received life sentences with minimum terms of 25 and 20 years respectively. The exact time of death was difficult to determine due to body storage in a freezer.
Uncertainty existed regarding the exact time of death due to body preservation in a freezer. Swinhoe gave conflicting accounts and never directly admitted to the murder, complicating the narrative.
Peter McMahon was strangled and mutilated at Sharon Swinhoe's home in October 2012. His body was transported in a suitcase and stored in a chest freezer. Swinhoe allegedly arranged the murder with Joseph Collins. Ronald Douglas assisted in moving the body. Swinhoe made multiple withdrawals from McMahon's bank account after his death. Testimony from prison mentor Ann Huxley revealed conflicting statements from Swinhoe, contributing to the conviction.
High risk due to escalation to lethal violence, financial exploitation, and involvement of multiple offenders with attempts to conceal evidence.
Conflicting victim-lover dynamics and financial exploitation can escalate to lethal violence. Concealment efforts such as body storage complicate time of death estimation. Prison witness testimony can be critical in uncovering offender behavior and statements.
Conflicting accounts by Swinhoe and financial withdrawals from the victim's account were early signals of foul play.
Testimony about strangulation details, blood on Swinhoe's hands, and body concealment were key clues.
Witness testimony, forensic evidence of strangulation and mutilation, and financial transaction records were strongest evidence.
Ann Huxley testified about Swinhoe's conflicting accounts and physical evidence such as blood on her hands. No other witness statements reported.
No follow-up reports available beyond sentencing and testimony.
Exact timing of death remains unclear due to body storage conditions. Swinhoe's full involvement details remain partially ambiguous due to conflicting statements.