Billy the Kid.

A lone bounty hunter kills a member of an outlaw gang and all Hell breaks loose. When soon-to-be-legendary Billy the Kid's mother is killed in the gang's bloody retaliation, he is forced to team up with the mysterious bounty hunter to avenge the death of his mother. Soon, he'll discover that his and the bounty hunter's lives are fatefully entwined in this shoot-'em-up tale of gun smoke and justice in the Old West.