Charles H. "Colorado Charlie" Utter was a figure of the American Wild West, best known as a great friend and companion of Wild Bill Hickok. He was also friends with Calamity Jane.

James Butler Hickok, better known as "Wild Bill" Hickok, was a folk hero of the American Old West known for his life on the frontier as a soldier, scout, lawman, cattle rustler, gunslinger, gambler, showman, and actor, and for his involvement in many famous gunfights. He earned a great deal of notoriety in his own time, much of it bolstered by the many outlandish and often fabricated tales he told about himself. Some contemporaneous reports of his exploits are known to be fictitious, but they remain the basis of much of his fame and reputation.