Friedrich Heinrich Karl Haarmann was a German serial killer who was born in Hanover on October 25, 1879 and executed on April 15, 1925 with a guillotine.

Joachim Kroll was a German cannibal and serial killer. He was convicted of eight murders despite admitting fourteen murders. Kroll started his series of murders in 1955 after his mother died. He worked as a toilet man for Mannesmann, later for Thyssen-Krupp.

"Kiss my ass.": Those were the last words of serial killer John Wayne Gacy. He was sentenced to death twelve times for 33 murders of young men and children - world record. The actual number of murder victims was taken to his grave by one of the most notorious serial killers of all time. He died from a lethal injection on May 10, 1994 at the Stateville Correction Center.

Serial killer Earle Leonard Nelson was born on May 12, 1897 and was hanged in Winnipeg on January 13, 1928. He escaped from Napa State Hospital several times. After his last escape, he began his series of murders in 1926.

Luis Garavito is a rapist and serial killer from Colombia. He was born on January 25, 1957. At the age of 35, he started talking to small children, luring them away, and then raping and killing them. He remained undetected for seven years.

In 2006, serial killer Ronald Dominique admitted to having committed 23 murders and numerous rapes in the federal state seed Lousiana. His victims were young men.

Andrej Romanovich Chikatilo is a serial killer from Ukraine. He started his first murder at the age of 41 and committed at least 53 murders of young women and children. The search for this murderer was one of the largest in Russian crime history.

Rodney James Alcala is an American serial killer who started his murder in 1971. He has been waiting for his death sentence in a California prison since 2010.

Theodore "Ted" Robert Bundy killed at least 28 young women between the age of 18 and his final arrest in 1978. Ted Bundy was found to have murdered 28 women, but at least 36 victims are suspected.

Randy Steven Kraft is an American serial killer who mainly took young men on the freeway in the early 1970s and then killed them.

American serial killer Gary Ridgway has been convicted of 48 murders. However, he stood twice as many. He murdered countless women and girls in Washington State. Most of the victims were prostitutes.

Anatoly Onoprienko was a 52-time serial killer from Ukraine. He started his murder series at the age of 19. Most of the time he went to abandoned houses and killed the whole family.

Henry Howard Holmes's real name Herman Webster Mudgett was born on May 16, 1860 and was executed on May 7, 1896 in Philadelphia, Pennsylvania. The exact number of its victims is not known, it is assumed that up to 200 victims.

Carl Panzram (AKA: Jeff Rhoades, John O’Leary) was born on June 28, 1891 in Minnesota and executed on September 5, 1930 in Leavenworth, Kansas Federal Prison.

Serial killer William Bonin killed at least 21 people in 13 months. He mostly dumped his victims on highways, hence the nickname The Freeway Killer.

Daniel Camargo Barbosa was a sadist and serial killer from Colombia. He killed about 150 young girls in Colombia and Ecuador in the 1970s and 1980s.