Article Photos: Oklahoma football: Sooners' secondary shaky without Aaron Colvin, Gabe Lynn 52/99

Oklahoma's Trey Millard (33) leaps over Tulsa's Darnell Walker (4) during a college football game between the University of Oklahoma Sooners (OU) and the Tulsa Golden Hurricane at Gaylord Family-Oklahoma Memorial Stadium in Norman, Okla., on Saturday, Sept. 14, 2013. Oklahoma won 51-20. Photo by Bryan Terry, The Oklahoman