Peter Tredget (born Peter George Dinsdale; 31 July 1960), formerly Bruce George Peter Lee, is a British serial killer and arsonist. He confessed to a total of 11 acts of arson, pleading guilty to 26 counts of manslaughter.

Heriberto "Eddie" Seda (born July 31, 1967), often referred to as The New York Zodiac or The Brooklyn Sniper, is an American serial killer who was active in New York City from 1990 through 1993. He fatally shot three people and wounded six others (four critically) before being caught on June 18, 1996.

Nicholas Troy Sheley (born July 31, 1979) is an American spree killer. He is serving life in prison for six murders in Illinois and two other murders in Missouri.

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.

Friedrich Paul "Fritz" Honka (31 July 1935 – 19 October 1998), also known as Peter Jensen, was a German serial killer. Between 1970 and 1975 he killed at least four women from Hamburg's red light district, keeping three of the bodies in his flat.

Juhani Aataminpoika (Finnish pronunciation: [ˈjuhɑni ˈɑːtɑminˌpoi̯kɑ]; born 31 July 1826 – September 1854) alias Kerpeikkari (Finnish: [ˈkerpei̯kːɑri]), was a Finnish serial killer. He killed 12 people in southern Finland between October and November of 1849.