Ahrens was drafted by the St. Louis Cardinals in the sixth round (143rd overall) of the 1981 NFL draft.[5] He recorded his only interception his rookie year, which was returned for a touchdown.[6] Ahrens played in all the games and started ten his rookie season, but his playing time diminished and after four years he was traded to the Indianapolis Colts[7] for a tenth-round pick in the 1986 NFL draft.[8]
Indianapolis Colts
Ahrens was traded to the Indianapolis Colts before the 1985 season. He did not start a single game in 1985 but had arguably his best NFL season in 1986, starting ten games,[9] and registering two quarterback sacks,[10] one of them helping the Colts secure their first win of the year late in the season against the Atlanta Falcons.[11]
Detroit Lions
Ahrens spent 1988 with the Detroit Lions but only played in half the games and was left unprotected.[12]
Miami Dolphins
Ahrens was signed by the Miami Dolphins before 1989[13] and recorded one sack with the team. Due to salary concerns, the Dolphins released him but he did sign a Plan B contract.[14]
Seattle Seahawks
Ahrens signed with the Seattle Seahawks in free agency before the 1990 season.[15] He was cut during final cuts[16] only to be re-signed by the team. Ahrens was placed on injured reserve following a broken leg against the Denver Broncos late in the season.[17]
Later life
Ahrens spent the 1991 season with the Colts as an assistant coach.[18] He was part of a large group of Colts players named in a 2011 concussion lawsuit against the NFL.[19]