After hiring three new assistant coaches this offseason, Oklahoma coach Bob Stoops is switching some duties around on his defensive staff.

Stoops said Thursday that Bobby Jack Wright, who had been in charge of defensive ends, will now oversee the cornerbacks. Defensive coordinator Mike Stoops will also be the safeties coach as the Sooners put more manpower in the secondary in the pass-heavy Big 12.

New hire Jerry Montgomery will coach the entire defensive line. Previously, Stoops had used one coach for the defensive ends and one for the defensive tackles. Tim Kish remains in charge of the linebackers.

Stoops refused to discuss the reasons he parted ways with ex-assistants Jackie Shipp, James Patton and Bruce Kittle.

The Sooners begin spring practice this weekend, with sessions planned Saturday and Sunday.