DES MOINES, Iowa (AP) — Iowa defensive coordinator Norm Parker says he’s retiring after 13 seasons with the Hawkeyes. The 70-year-old Parker says in a statement released by the school that he’s stepping down following Iowa’s matchup with Oklahoma in the Insight Bowl on Dec. 30. The Hawkeyes have not yet said who will replace Parker.

Iowa ranked in the top 10 nationally in scoring defense in 2008, 2009 and 2010 under Parker, who was recently named the Assistant Coach of the Year by the American Football Coaches Association. But Parker battled health issues last season and had his foot amputated in the fall of 2010 because of diabetes. Parker began his college coaching career in 1968 and also made stops at Wake Forest, Minnesota, Illinois, East Carolina, Michigan State and Vanderbilt.