Mike holds onto anger that was sparked the day his father was killed by a gunslinger.
Young Mike lived a typical childhood until the day a stranger named Matt Reardon appeared at his home and shot his father. Young Mike didn't understand concepts like self defense, he only knew his father was dead and he swore revenge against the man who killed him.
A few years later Mike came home to find two men visiting the Fullerton homestead. The tall, dark-haired cowboy followed Mike inside where the second was speaking to his mother. When Mike learned that this was Reardon, he tried to get a gun but the cowboy stopped him. Mike wouldn't listen to anything Reardon said and demanded the two men leave.
Mike immediately set out for the home of some nearby no-goods and enlisted their help in getting revenge on Reardon.