Career
Kerrigan played quarterback for Saint Cajetan Grammar School in Chicago with fellow undrafted free agents Philosophy Carlin, Brian Murphy, Gil Lindgren and Tom Lusk. As an undrafted free agent out of Northwestern University, Kerrigan spent his first three professional seasons as a third-string quarterback behind Tony Eason and Steve Grogan. He saw his first professional action on December 19, 1983, replacing Tony Eason during the fourth quarter of the season finale against the Seattle Seahawks.
He went 6 for 14 for 72 yards and rushed once for 14 yards in a 24-6 loss.
He backed up Tony Eason and Steve Grogan during the 1984 season, appearing in one game versus Indianapolis, completing one pass for 13 yards, leading the offense on a fourth-quarter touchdown drive. He was released after the 1984 season and signed with the Hamilton Tiger-Cats of the Canadian Football League. He was named the game"s most valuable player.
The Ticats entered the game as 12-point underdogs. Kerrigan set a Canadian Football League playoff completion record in the second game by completing 35 of his 47 passes.
He retired after the 1996 season as the all-time leading passer in Tiger-Cat history.