Morris was a three-year starter at center and linebacker for the Crusaders and served as team captain during his senior season. He was a two-time first team All-New England selection, and after his senior season he was selected to play in both the Senior Bowl and the College All-Star game. He was also featured in Who's Who in American Colleges.
Following his graduation, Morris was drafted in both the National Football League (Green Bay Packers, second round) and the American Football League (Boston Patriots, fourth round). He went on to have a 15-year professional career, with the Patriots (1964-1974), the Detroit Lions (1975-1977) and the Chicago Bears (1978), playing in 182 games. A first team All-AFL selection by the Associated Press in 1966, Morris played in the AFL Pro Bowl every year from 1964-1969, and the NFL Pro Bowl in 1970.
He was named to the All-Time AFL second team, and was also chosen as the starting center on the Patriots’ 50th anniversary team. Morris was inducted into the New England Patriots Hall of Fame in 2011.