Billy the Kid, born Henry McCarty, (1859 – 1881) was an American Old West outlaw and gunfighter who killed eight men before he was shot and killed at age 21. He took part in New Mexico's Lincoln County War, during which he allegedly took part in three murders.

Charles Angelo Siringo (1855 – 1928) was an American lawman, detective, bounty hunter, agent for the Pinkerton National Detective Agency during the late 19th and early 20th centuries.