According to the Associated Press, "Texas Tech defensive coordinator Lyle Setencich stepped down Sunday, citing personal reasons in a move that came a day after the Red Raiders lost to Oklahoma State 49-45... Coach Mike Leach named assistant head coach Ruffin McNeill as the interim defensive coordinator. Setencich, who was in his fifth year as coordinator, will be assigned other duties by athletic director Gerald Myers."
Texas Tech defensive coordinator Lyle Setencich steps down - NCAA Football - Yahoo! Sports