He spent most of his career with the St.Louis / Phoenix Cardinals and retired as the franchise's all-time sacks leader.
[1] He played collegiately for the Ole Miss Rebels,[2] where, as a senior, he was honored by United Press International (UPI) as a first-team All-American.
[3] Nunn was selected by the St. Louis Cardinals in the first round (18th overall) of the 1985 NFL draft.
[4] He started his career as a defensive end and later moved to the linebacker position.
[5] At the time of his death on October 16, 2021, Nunn's 66.5 sacks as a Cardinal stood as an official franchise record.