Mullaney attended Colorado State where he played on both offensive line and defensive line. He played in 12 NFL seasons from 1975 to 1987 for the Vikings and is 9th on the Vikings  all-time sack list with 45½ sacks.
Mullaney attended Colorado State where he played on both offensive line and defensive line. He participated in 12 NFL seasons from 1975 to 1987 for the Vikings and is ranked 9th on the Vikings all-time sack list with 45½ sacks.