Iowa defensive coordinator Norm Parker looks on as the Iowa Hawkeyes start practice Tuesday. Parker will retire following Iowa's contest against No. 19 Oklahoma.

Chigozie Ejiasi, who is Iowa's director of player development, talks with players just before the Hawkeyes' practice Tuesday.

Iowa senior defensive end Broderick Binns

Iowa junior cornerback Greg Castillo

Iowa redshirt freshman wide receiver Kevonte Martin-Manley

LeVar Woods, who has served as the team's Administrative Assistant, was promoted as the interim defensive line coach after former assistant Rick Kaczenski left the team to become the defensive line coach at Nebraska last week.

Iowa sophomore fullback Brad Rogers takes to the practice field. Rogers missed the 2010 Insight Bowl against Missouri due to a heart condition that also kept him from playing during the early portion of this season.

Iowa head coach Kirk Ferentz looks on as he takes to the practice field Tuesday.

Iowa junior quarterback James Vandenberg

Iowa senior wide receiver Marvin McNutt

Iowa senior defensive tackle Mike Daniels

Iowa junior cornerback Micah Hyde

Iowa senior cornerback Shaun Prater

Iowa wide receivers coach Erik Campbell talks with junior wide receiver Keenan Davis just before the Hawkeyes begin practice Tuesday.

The offensive line takes part in a drill during Tuesday's practice.

Junior quarterback James Vandenberg tossing the ball around before the Hawkeyes' practice Tuesday.

Junior offensive tackle Riley Reiff taking part in the team's warm-up stretches during practice Tuesday.

Players stretching during warm-ups at the start of Tuesday's practice.

Sophomore cornerback B.J. Lowery is taking part in a special teams drill during practice Tuesday.

Wide receivers Marvin McNutt and Keenan Davis take part in a drill during Tuesday's practice.

The offensive line does a drill during Tuesday's practice.

Iowa defensive coordinator Norm Parker is interviewed following Tuesday's practice. Parker previously announced he'll retire following Iowa's match-up with No. 19 Oklahoma.