Petr Zelenka (born February 27, 1976) is a Czech serial killer. As a nurse in hospital Havlíčkův Brod, 100 kilometres (62 mi) southeast of Prague, he murdered seven patients by lethal injection, and attempted to kill 10 others between May and December, 2006.

John Thomas Straffen (27 February 1930 – 19 November 2007) was an English serial killer who committed the murder of three prepubescent girls between the ages of five and nine in the counties of Somerset and Berkshire, England, between 1951 and 1952.

Shirley Winters (born February 27, 1958) is a convicted murderer, arsonist, and suspected serial killer from upstate New York. In 1980, she smothered her five-month-old son, Ronald Winters III.

Luigi Chiatti (born 27 February 1968 in Narni) is an Italian murderer, named "The Monster of Foligno" by the media.

Alexander Viktorovich Solonik (Russian: Алекса́ндр Ви́кторович Соло́ник; 16 October 1960 – 31 January 1997) was a Russian gangster, known for his reputation as a notorious hitman in the Russian criminal underworld. Also known as Sasha-Macedonian, Alexander the Great and Superkiller, Solonik was involved in Russian Mob activity for much of the 1990s until disappearing after his second escape from prison.