Juan Díaz de Garayo y Ruiz de Argandoña, also known as "The Sacamantecas" ("The fat extractor" in Spanish) (17 October 1821 – 11 May 1881), was a Spanish serial killer active near Vitoria, Álava, who strangled five women and a 13-year-old girl, and attacked four other women during two different periods, 1870 to 1874 and 1878 to 1879. A lust-motivated serial killer, Garayo first killed prostitutes after hiring and sleeping with them consensually but grew more disorganized and violent as time went on, attacking, raping and murdering women that he saw walking alone in the country.

Lyda Southard (October 16, 1892 – February 5, 1958), also known as Lyda Anna Mae Trueblood, was an American female suspected serial killer. It was suspected that she had killed four of her husbands, a brother-in-law, and her daughter by using arsenic poisoning derived from flypaper in order to obtain life insurance money.

Andrei Romanovich Chikatilo (Russian: Андрей Романович Чикатило; Ukrainian: Андрій Романович Чикатило, romanized: Andrii Romanovych Chykatylo; 16 October 1936 – 14 February 1994) was a Ukrainian-born Soviet serial killer nicknamed "the Butcher of Rostov", "the Rostov Ripper", and "the Red Ripper" who sexually assaulted, murdered, and mutilated at least fifty-two women and children between 1978 and 1990 in the Russian SFSR, the Ukrainian SSR, and the Uzbek SSR.

Alois Weiss (or: Weiß) (16 October 1906 in Ruma, Austria-Hungary – 26 February 1969 in Straubing, Germany) was the executioner at the Gestapo Pankrác prison in Prague during the Second World War.

Andrei Romanovich Chikatilo (Russian: Андрей Романович Чикатило; Ukrainian: Андрій Романович Чикатило, romanized: Andrii Romanovych Chykatylo; 16 October 1936 – 14 February 1994) was a Ukrainian-born Soviet serial killer nicknamed "the Butcher of Rostov", "the Rostov Ripper", and "the Red Ripper" who sexually assaulted, murdered, and mutilated at least fifty-two women and children between 1978 and 1990 in the Russian SFSR, the Ukrainian SSR, and the Uzbek SSR.