On the evening of July 10th, 2007, twenty-three-year-old Colin Marr died from a single stab wound to the chest at the home he shared with his fiancée in Lochgelly, Fife, Scotland. Although police quickly concluded that Colin had taken his own life, his family has spent nearly two decades challenging that assumption, arguing that the investigation was deeply flawed and that crucial forensic opportunities were lost. Today, the circumstances surrounding his death remain among Scotland’s most controversial disputed death investigations.
Colin was a mortgage adviser who lived with his fiancée, Candice Bonar, at their home on Johnston Crescent in Lochgelly. Friends and relatives described him as outgoing and ambitious, and the couple were planning to marry.
In the weeks before his death, however, their relationship had become strained after Candice learned that Colin had been involved in an affair with another woman. According to testimony later presented during legal proceedings, tensions between the couple had escalated significantly as Candice confronted him about the infidelity.
According to Candice’s account, she arrived at the house intending to end the relationship. During an emotional argument, she removed her engagement ring and told Colin their relationship was over.
Candice later told investigators that Colin became distraught and threatened to kill himself if she left. She said she briefly moved into another room before hearing noises from the kitchen. Moments later, she claimed Colin told her he had stabbed himself.
She ran to neighboring houses seeking help shortly after eight fifteen p.m., and an ambulance was called. Despite emergency treatment from paramedics, Colin Marr died at the scene. He had suffered a single stab wound that entered the lower sternum, pierced the heart, and proved rapidly fatal.
Former Fife Constabulary officers quickly concluded that Colin had died by suicide. Because investigators believed there were no suspicious circumstances, the scene was not processed as a homicide investigation. No forensic scientists, fingerprint specialists, or pathology experts examined the property that evening. The knife was recovered, but many forensic opportunities normally associated with an unexplained fatal stabbing were not pursued. This early decision would become the central focus of criticism in the years that followed.
Almost immediately, Colin’s mother, Margaret Graham, and stepfather, Stuart Graham, rejected the suicide conclusion. Among their concerns were the unusual location and severity of the stab wound; the absence of a full forensic examination of the scene; injuries, including an abrasion to Colin’s forehead, that they believed required further explanation; and the speed with which investigators dismissed homicide as a possibility.
The family argued that police had effectively decided the cause of death before conducting a thorough investigation. Over the following years, they campaigned publicly for a fresh inquiry, alleging serious investigative failures by the police and prosecutors.
A Fatal Accident Inquiry (FAI) was held in Dunfermline in 2011. The inquiry established the medical cause of death as a single stab wound passing through the lower sternum, heart, and pericardial sac. However, Sheriff Principal Robert Dunlop concluded that the available evidence did not allow the court to determine whether Colin Marr had stabbed himself or whether another person had inflicted the wound.
Importantly, the inquiry found that there was no conclusive evidence that Colin had committed suicide; but equally, there was insufficient evidence to conclude that Candice Bonar had killed him. Rather than resolving the dispute, the inquiry left the manner of death officially undetermined.
Subsequent reviews identified significant shortcomings in the original investigation. The Police Investigations and Review Commissioner (PIRC) upheld numerous complaints made by Marr’s family regarding the handling of the case. Critics highlighted failures including delayed engagement with the family; inadequate forensic preservation of the scene; failure to obtain specialist forensic advice immediately after the death; and investigative decisions that effectively prevented later forensic reconstruction.
These findings strengthened the family’s long-standing argument that the case had not been properly investigated from the outset.
Public interest in the case intensified in the early 2020s after further expert reviews questioned aspects of the original forensic interpretation. In 2023, Scottish authorities confirmed that new forensic and pathology examinations would be undertaken. The review followed renewed scrutiny of earlier expert opinions and continuing pressure from Colin Marr’s family.
The family maintains that modern forensic analysis will demonstrate that the fatal injury is inconsistent with suicide. Candice Bonar has consistently denied any involvement in Colin Marr’s death and has maintained that he inflicted the wound himself during the argument. She voluntarily gave evidence during the Fatal Accident Inquiry and has repeatedly stated that she has always told the truth.
As of 2026, the Crown Office continues to review the findings of the renewed forensic investigation. No criminal charges have ever been filed in connection with Colin Marr’s death.
Crime Immemorial 