Question: What American professional boxer, boxing commentator, boxing trainer, rapper, and actor, was involved in fights refereed by Ron Lipton?
Sentence (from "Roy Jones Jr."): He is a six-time former world champion in four weight classes, having held titles at middleweight, super middleweight, light heavyweight, and heavyweight; and is the only boxer in history to start his professional career at light middleweight and go on to win a heavyweight title.
Relevant evidence: No