Gianfranco Stevanin (born 2 October 1960), known as The Monster of Terrazzo, is an Italian criminal and serial killer, convicted of murdering six women between 1993 and 1994. His case had great prominence in the national media and raised a debate on the question of the incapability of criminals to understand the consequences of their acts.

Ernst-Dieter Beck (2 October 1940 – 29 April 2018) was a German serial killer. He was the first person accused of murder in German legal history on whom a chromosome test was applied.

Frederick Mors (born Carl Menarik, 2 October 1889 – 1918?) was an Austrian serial killer. Mors killed eight elderly patients by poison while employed in a nursing home in New York City.