Alan Williamson

Alan Williamson was the father of Bill Williamson.

Role in the movies
Alan plays a small role in the Rampage movies overall, but he does have a big impact other than helping give birth to Bill. He pressured Bill to move out and find his own place, which angrily influenced Bill to start taking up bank robbing as a means to provide for himself.

Death
In the third movie, the FBI confirms from their Deceased Database that he committed suicide through unknown means to escape the guilt from his son's murders.