Male Killers

Christopher Gregory Davis murdered his boyfriend, 56-year-old Barry Schmalbach, in Cape Coral, Florida, after Schmalbach planned to end their relationship in July 2023. Although Schmalbach's body has never been recovered, investigators built an extensive circumstantial case showing Davis using his boyfriend's financial accounts, purchasing items associated with concealing and disposing of a body, renting an isolated property under a false identity and attempting to dispose of tools. In June 2025, a Lee County jury convicted Davis of second-degree murder, tampering with evidence and eight identity-related offences. He was sentenced to life imprisonment plus 45 consecutive years.

Christopher McGowan murdered his girlfriend, Claire Inglis, in Stirling, Scotland, in November 2021 after being released on bail to live at her home despite an extensive history of violent offending. Claire had begun a relationship with McGowan unaware of his violent past, and after he moved into her home she became trapped in an escalating pattern of coercive control, abuse and violence. McGowan subjected her to a prolonged and sadistic assault before strangling her to death. In 2023, he was convicted of murder and sentenced to life imprisonment with a minimum term of 23 years.

Christopher Monks Jr. became the subject of a high-profile criminal case after conspiring to murder his adoptive parents in Kent, England, in 2009. The plot involved recruiting an online acquaintance, Shaun Skarnes, to carry out the killings while his parents slept. The attack failed when Christopher Monks Sr. awoke and disarmed the intruder before police were called. Monks was convicted of conspiracy to murder and made subject to an indefinite hospital order.

Clifford Robert Olson Jr., known as the "Beast of British Columbia," was a Canadian serial killer who murdered 11 children and teenagers in British Columbia between November 1980 and July 1981. His victims, eight girls and three boys, ranged from nine to 17 years old and were abducted from communities around Vancouver and the Lower Mainland. Olson was arrested in August 1981 after police surveillance caught him attempting to pick up two young hitchhikers. He pleaded guilty to 11 counts of first-degree murder in January 1982 and received 11 concurrent life sentences with no parole eligibility for 25 years. He remained imprisoned until his death from cancer in September 2011.

Colin Ireland became one of the United Kingdom's most infamous serial killers after murdering five gay men in London over a seven-week period in 1993. Seeking notoriety, Ireland later admitted he deliberately set out to become a serial killer after reading an article suggesting Britain had none. Nicknamed the "Gay Slayer," he targeted men he met in London pubs before strangling them in their own homes. His brief but deadly murder spree shocked Britain and remains one of the country's most disturbing examples of predatory serial homicide.

Craig Mulligan became one of the United Kingdom’s most shocking juvenile killers after being convicted for his role in the murder of a five-year-old child in South Wales in 2021. The case horrified Britain because Mulligan was only 13 years old at the time of the killing, making him one of the youngest convicted murderers in modern Welsh criminal history. The investigation generated enormous public outrage after details emerged about abuse inside the household, repeated safeguarding failures and warnings allegedly ignored by authorities before the murder occurred. The case later became one of Britain’s most disturbing examples of child-on-child violence combined with systemic failures involving social services and child protection agencies.

Curtis Wayne Wright became known in American criminal history after participating in the 2015 murder-for-hire of Dr. Teresa Sievers in Bonita Springs, Florida. A longtime friend of Teresa's husband, Mark Sievers, Wright helped plan the killing before recruiting Jimmy Rodgers to assist in carrying out the attack. Wright later pleaded guilty, cooperated with prosecutors, and testified against both Rodgers and Mark Sievers, making him the key witness in one of Florida's most high-profile murder-for-hire cases.

Dale Bradley Jr. was convicted of killing 22-year-old Kennecott security guard Bryan Ruff in Utah in December 1991. Ruff, who was having an affair with Bradley's first wife, Kristi, disappeared from his guard post during a night shift and was found nearly 19 months later in a shallow grave near Five Mile Pass. Investigators eventually linked Bradley to the killing through physical evidence and witness testimony. Bradley originally faced a first-degree murder charge but entered an Alford plea to manslaughter and kidnapping in 2007 and received two consecutive prison terms of two to 20 years. In 2025, while seeking parole, Bradley finally admitted that he shot Ruff, saying anger and jealousy had overtaken him.