McCarthy and Hairston, 53, both worked together in Kansas City while McCarthy was with the Chiefs from 1993-98. Hairston has spent the last seven seasons with the Chiefs, and was their defensive line coach in 1995 and '96. Between stints with the Chiefs, he was the St. Louis Rams' defensive line coach from 1997-2000.
Nunn coached the Packers' defensive tackles last year.
Hairston has spent 30 seasons in the NFL as a player and coach. He played for the Philadelphia Eagles (1976-83), then spent six years in Cleveland (1984-89) and one final campaign with the then-named Phoenix Cardinals (1990). In 224 games (184 starts), he posted 94 sacks among 1,141 tackles. He started for the Eagles at defensive end in Super Bowl XV against the Oakland Raiders, one of his 15 postseason contests played.
The Packers' nearly complete coaching staff now includes six former NFL players, including Edgar Bennett, James Campen, Winston Moss, Jimmy Robinson and Lionel Washington. McCarthy has a few positions remaining on his staff, including quarterbacks coach and defensive secondary coach. He reportedly has interviewed Chuck Knox, Jr., whom he worked with in 1999 in Green Bay when both were assistants under Ray Rhodes, to assist Washington in coaching the secondary.
Marty Schottenheimer gave Hairston his first full-time coaching position at any level, Chiefs defensive line coach (1995-96), a role in which he worked with then-quarterbacks coach McCarthy. Tutoring one of the most-feared defensive fronts, Hairston and his players helped the 13-3 Chiefs finish third in the NFL with 47 sacks. Again, his unit produced a pair of Pro Bowl performers, Neil Smith and Dan Saleaumua.
Originally a pro scout with the Chiefs in 1994, Hairston also spent three seasons (1991-93) as a college scout with the Cardinals, where he had finished his playing career.
Under Hairston, Chiefs defensive end Jared Allen accumulated 20 sacks from 2004-05, tied for 10th in the NFL during that period but first among players drafted in 2004, including 23 defensive linemen taken before him. Led by Allen's nine sacks as a rookie, the Chiefs finished 2004 with 41 sacks, seventh in the league.