For a time before the outbreak, Chase worked as a sheriff in Texas. Towards the end of his career, he arrested a local football player for the rape and murder of a cheerleader. This led to him becoming unpopular in his town, and the townspeople had him discharged. No longer wanting to be reminded of his career, Chase drove a truck into Oklahoma to start anew.
During the viral outbreak, Claire Redfield's convoy found Chase in Oklahoma and accepted him as a member.