Unknown Killers

Aaron Campbell became one of Scotland's most infamous child killers after abducting and murdering seven-year-old Megan Montgomery in Airdrie, North Lanarkshire, in 2020. Campbell lured the child from outside her home before killing her and concealing her body in nearby woodland. Following an extensive police investigation, he was convicted of murder and sentenced to life imprisonment with one of the longest minimum terms imposed in Scotland for the murder of a child.

Albert Fish became one of the most horrifying killers in American history after murdering children during the early 1900s and later sending grotesque letters to victims’ families. Known for extreme sadism, self-harm and cannibalistic behavior, Fish terrorized New York and surrounding states while hiding behind the appearance of a quiet elderly man. Often referred to as “The Gray Man,” “The Boogeyman” and “The Werewolf of Wysteria,” Fish shocked investigators and the public because of the disturbing nature of his crimes and psychological abnormalities. His case became one of the earliest high-profile examples of criminal profiling and remains one of the darkest child murder cases in American true crime history.

Alexander Christopher Ewing was responsible for four murders during a series of violent attacks in the Denver metropolitan area in January 1984. On January 10, he sexually assaulted and murdered 50-year-old Patricia Louise Smith in her Lakewood home, and six days later attacked the Bennett family in Aurora, killing Bruce Bennett, his wife Debra and their seven-year-old daughter Melissa with a hammer. The crimes remained unsolved for more than three decades until DNA evidence linked Ewing, who was already serving a prison sentence in Nevada, to the killings. He was convicted of the three Bennett murders in 2021 and Patricia Smith's murder in 2022, receiving three consecutive life sentences for the Bennett killings and another life sentence for Smith's murder.

Anders Behring Breivik is a Norwegian domestic terrorist responsible for the 2011 attacks in Oslo and on the island of Utøya, the deadliest act of violence in Norway since World War II. His coordinated attack involved a car bombing followed by a mass shooting, resulting in 77 deaths. Breivik was arrested on the day of the attacks and later convicted of terrorism and mass murder. He received the maximum sentence under Norwegian law, with provisions allowing for indefinite extension based on continued risk.

Andrei Chikatilo became one of the Soviet Union’s most infamous serial killers after murdering and mutilating dozens of women and children across Russia and Ukraine between 1978 and 1990. Nicknamed “The Butcher of Rostov” and “The Red Ripper,” Chikatilo terrorized the Soviet Union for over a decade while authorities struggled to identify the perpetrator amid political pressure, investigative failures and widespread public fear. His crimes shocked investigators because of their extreme brutality, sexual sadism and mutilation of victims. Chikatilo appeared outwardly quiet and socially awkward, allowing him to blend into ordinary Soviet society while secretly carrying out one of the deadliest serial murder sprees in modern history. His eventual arrest and confession exposed major flaws within the Soviet criminal justice system and transformed the case into one of the most notorious serial killer investigations ever conducted behind the Iron Curtain.

Austin Drummond became the focus of a massive manhunt after being accused of murdering four members of a Tennessee family in a brutal quadruple homicide case. Authorities alleged Drummond carried out the killings before abandoning a surviving infant connected to the victims, a detail that intensified national outrage and media attention surrounding the investigation. The horrifying nature of the crimes shocked communities across Tennessee as law enforcement agencies launched a widespread search operation to locate Drummond. Investigators described the suspect as armed and dangerous while prosecutors later outlined allegations involving execution-style killings, family targeting and efforts to evade capture following the murders.

Austin David Thompson carried out a mass shooting in Raleigh's Hedingham neighborhood on October 13, 2022, killing five people and injuring two others. Thompson, who was 15 at the time, first killed his 16-year-old brother James inside their home before leaving the house and shooting people in the surrounding neighborhood, including off-duty Raleigh Police Officer Gabriel Torres. He later pleaded guilty to five counts of first-degree murder and additional charges. In February 2026, Thompson was sentenced to five consecutive life terms without the possibility of parole.

Brandon Andrew Clark became one of the most notorious killers in recent American criminal history after murdering 17-year-old internet personality Bianca Devins in Utica, New York, on July 14, 2019. The case received worldwide attention after Clark posted graphic photographs of the crime scene on social media, prompting renewed debate about online communities, the rapid spread of violent content, and the responsibilities of social media platforms. Clark later pleaded guilty to second-degree murder and was sentenced to 25 years to life in prison.