He spent the majority of his career with the San Diego Chargers before finishing with the St. Louis Rams and the Kansas City Chiefs.
He was named NFL Defensive Rookie of the Year, but suffered a major knee injury at the end of his first season.
O'Neal played college football for the Oklahoma State Cowboys, and twice earned All-American honors.
[5] He was named the NFL Defensive Rookie of the Year in 1986 after recording 12+1⁄2 sacks for the season, including a team-record five on November 16 against the Dallas Cowboys.
[1] O'Neal led the Chargers in sacks every season from 1990 through 1995,[1] earning three second-team All-Pro selections in that span.