Question: Which retired American football player played defense for the 1983 Dallas Cowboys, and briefly left football in 1979 to pursue a career in boxing?
Sentence (from "1983 Dallas Cowboys season"): The team started the season with seven straight victories, including a memorable Monday night win over the Washington Redskins in which the team erased a 20-point halftime deficit and prevailed, 31–30.
Relevant evidence: No