Unknown Killers

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.

Robert Clive Napper became one of the United Kingdom's most infamous serial killers after murdering Rachel Nickell in 1992 and Samantha Bisset and her four-year-old daughter, Jazmine, in 1993. Before his identification, Napper committed numerous violent sexual assaults across South East London, becoming known as the "Green Chain Rapist." Advances in DNA profiling eventually linked him to the murders after years of investigative failures, making his case one of Britain's most significant forensic breakthroughs.

William Harp became widely known after the tragic murder of his daughter, Katlyn Harp, in a deeply disturbing family violence case in West Virginia. The case shocked local communities because the crime involved a father killing his own child and later attempting to conceal aspects of the investigation. Authorities described the murder as brutal and emotionally devastating, with evidence later revealing a history of abuse and violence inside the household. The case generated major regional media attention and highlighted ongoing concerns surrounding domestic violence, child abuse and failures to protect vulnerable children from family members.

Zachary Harp became publicly known following his involvement in the investigation into the death of his sister, Katlyn Harp, in West Virginia. The deeply disturbing family murder case generated outrage because multiple household members were accused in connection with the abuse and killing of the teenage victim. Authorities alleged Zachary Harp participated in violence and abuse directed toward Katlyn before her death. Prosecutors described the case as involving severe mistreatment within the household, with evidence pointing to prolonged abuse and efforts to conceal what occurred. The investigation shocked the local community and drew significant regional media attention.