Hamilton Howard "Albert" Fish (May 19, 1870 – January 16, 1936) was an American serial killer, rapist, child molester and cannibal who committed at least three child murders between July 1924 and June 1928. He was also known as the Gray Man, the Werewolf of Wysteria, the Brooklyn Vampire, the Moon Maniac, and the Boogey Man. Fish was a suspect in at least ten murders during his lifetime, although he only confessed to three murders that police were able to trace to a known homicide. He also confessed to stabbing at least two other people.

Fish once boasted that he "had children in every state", and at one time stated his number of victims was about 100. However, it is not known whether he was referring to rapes or cannibalization, nor is it known if the statement was truthful. Fish was apprehended on December 13, 1934, and put on trial for the kidnapping and murder of Grace Budd. He was convicted and executed by electric chair on January 16, 1936, at the age of 65

Herbert Richard Baumeister (April 7, 1947 – July 3, 1996) was an American businessman and suspected serial killer who came under suspicion of murdering over a dozen men in the early-to-mid 1990s, most of whom were last seen at gay bars in central Indiana. Police ultimately found the remains of eleven men, eight identified, on Baumeister's property. He died by suicide after a warrant was issued for his arrest. Since his death, he has come under suspicion for the murders of twelve other men along Interstate 70 in Indiana and Ohio, which occurred from the early 1980s to the early 1990s.

Hadden Irving Clark (born July 31, 1952) is an American murderer and suspected serial killer currently serving two 30-year sentences for the murders of 6-year-old Michele Lee Dorr in 1986, and 23-year-old Laura Houghteling in 1992. He was also given a 10-year sentence for robbery after stealing from a former landlord.

Joseph Edward Duncan III (February 25, 1963 – March 28, 2021) was an American convicted serial killer and child molester who was on death row in federal prison following the 2005 kidnappings and murders of members of the Groene family of Coeur d'Alene, Idaho. He was also serving 11 consecutive sentences of life without parole for the 1997 murder of Anthony Martinez of Beaumont, California. Additionally, Duncan confessed to — but had not been charged with — the 1996 murder of two girls, Sammiejo White and Carmen Cubias, in Seattle, Washington. At the time of the attack on the Groene family, Duncan was on the run from a child molestation charge in Minnesota.

Lawrence Sigmund Bittaker (September 27, 1940 – December 13, 2019) and Roy Lewis Norris (February 5, 1948 – February 24, 2020), also known as the Tool Box Killers, were two American serial killers and rapists who committed the kidnapping, rape, torture and murder of five teenage girls in Southern California over a five-month period in 1979.

Described by FBI special agent John Edward Douglas as the most disturbing individual for whom he has ever created a criminal profile,

Susan Marie Powell Cox; born October 16, 1981) is an American missing person from West Valley City, Utah, whose disappearance and suspected murder in December 2009 garnered national media attention. Her husband, Joshua Powell, was named by law enforcement as a person of interest in the case but was never charged. Joshua killed himself and the couple's two young sons in February 2012 after custody of the boys had been given to Susan's parents.

Sorry for the mix up, episodes 5 and 6 are switched around.

Arthur John Shawcross (June 6, 1945 – November 10, 2008), also known as the Genesee River Killer, was an American serial killer active in Rochester, New York, between 1972 and 1989. Shawcross's first known murders took place in his hometown of Watertown, New York, where he killed a young boy and a girl. Under the terms of a plea bargain, he was allowed to plead guilty to one charge of manslaughter, for which he served 14 years of a 25-year sentence.

Joseph Kallinger (born Joseph Lee Brenner III; December 11, 1935 – March 26, 1996) was an American serial killer who murdered three people and tortured four families. He committed the later crimes with his 12-year-old son Michael.