Carl Panzram claimed to have committed 21 murders and over a thousand rapes. He was executed in 1930.
Jane Toppan confessed to 31 murders in 1901. She was found not guilty by reason of insanity.Wikimedia Commons
Albert Fish, AKA The Brooklyn Vampire, AKA The Werewolf of Wysteria, claimed to have raped and eaten about 100 children. He was executed in the electric chair in 1936.
Arthur Shawcross, AKA The Genesee River Killer, murdered at least 14 people.
Aileen Wuornos killed seven men and was executed by lethal injection in 2002.
Dennis Rader, known as the BTK Killer (standing for "Bind, Torture, Kill") murdered 10 people between 1974 and 1991.
Edmund Kemper, better known as The Co-Ed Butcher or simply "Big Ed," was responsible for the deaths of ten people, including his own mother and grandparents.
David Alan Gore committed six murders and was executed in 2012 after nearly 30 years on death row.
Charles Manson claims never to have committed any murders himself, but was convicted through the joint-responsibility rule after his followers, the Manson Family, killed several people.
David Berkowitz, the notorious Son Of Sam killer, shot 13 people during the summer of 1976, killing six.
Gary Ridgway, the Green River Killer, was convicted of strangling 49 people, and has since confessed to twice that number.
John Wayne Gacy, the Killer Clown (so named for his job of dressing as a clown at children's parties), murdered at least 33 people. He was executed in 1994.
Henry Lee Lucas was convicted of murdering 11 people and is serving a life sentence in prison.
Ian Brady, along with partner Myra Hindley, was responsible for the so-called Moors Murders that took place between 1963 and 1965 in England. They killed five children and were sentenced to life in prison.
H. H. Holmes, one of the first documented serial killers, confessed to 27 murders, although it's thought the figure could be as high as 200. He was hanged in 1896—as his neck did not break, it took him over 15 minutes to die.
Jeffrey Dahmer, AKA the Milwaukee Cannibal, was killed by a fellow prison inmate in 1994 following his conviction for the murder of 15 people. His crimes involved rape, necrophilia and cannibalism.
Peter Kurten, known as the Vampire of Düsseldorf, killed seven people and attacked many others. He admitted to drinking the blood of at least one victim and was executed by guillotine in 1931.
John Haigh, better known as the Acid Bath Murderer, killed at least six people in Britain. He was executed in 1949.
Ted Bundy confessed to 30 homicides before his execution in the electric chair in 1989.
Peter Sutcliffe, AKA the Yorkshire Ripper, was convicted of the murder of 13 women, and the attempted murder of a further seven. He was arrested in 1981 and is still in prison.
Richard Ramirez, dubbed the Night Stalker, committed 13 murders. He died from complications related to his B-cell lymphoma after 23 years on death row.