Michael Ross
Michael Ross is a serial killer known for the murders of multiple women in Connecticut during the 1980s.
Michael Ryan
Michael Ryan was a British mass murderer responsible for the 1987 Hungerford massacre in England. Armed with multiple firearms, he carried out a series of shootings across the town, killing numerous victims. Ryan ultimately died by suicide following a police standoff. The incident led to significant changes in UK gun laws and remains one of the most impactful mass shootings in British history.

Michael Swango
Michael Swango became one of the most notorious medical serial killers in American history after being linked to a series of poisonings involving patients, coworkers, and acquaintances over several decades. A licensed physician and former paramedic, Swango exploited positions within hospitals and medical institutions to gain access to vulnerable victims while maintaining the outward image of a highly educated healthcare professional. The case generated international attention because Swango continued obtaining medical employment despite repeated suspicions, disciplinary actions, and criminal convictions. Investigators later connected him to deaths and poisonings across the United States and Africa, leading many experts to believe the true number of victims may never be fully known. His ability to repeatedly evade detection turned the case into one of the most disturbing examples of institutional failure and medical predation in modern criminal history.
Michael Wayne Ryan
Michael Wayne Ryan is the convicted killer involved in multiple murder cases
Mick Philpott
Mick Philpott is a British man convicted of the manslaughter of six of his children in a house fire in Derby in 2012. The fire was deliberately started as part of a plan to frame his former partner in a custody dispute, but it tragically resulted in the deaths of the children. The case shocked the United Kingdom due to the scale of the tragedy and the calculated nature of the plan. Philpott was sentenced to life imprisonment, and the case sparked widespread public debate about social services and family welfare oversight.
Mikhail Popkov
Mikhail Popkov is a Russian police officer known as 'The Werewolf' for committing multiple murders in the city of Irkutsk, Russia.
Mitchell Quy
Mitchell Quy is a husband who is portrayed as a killer in the True Crime Documentary 'Husband Or Heartless Killer: The Story of Mitchell Quy' (2017)

Mitchell Sims
Mitchell Sims became one of America's most notorious transient serial killers after carrying out a series of murders across multiple states during the 1980s. Nicknamed the "Pizza Hut Serial Killer," Sims was convicted of abducting, robbing, and murdering pizza delivery driver John Harrington in Las Vegas, Nevada, while investigators also linked him to the murders of another pizza employee and a customer in South Carolina. His willingness to kill complete strangers during robberies, combined with his mobility across state lines, made him one of the FBI's most infamous traveling serial offenders before his execution in 2015.