Article Photos: Oklahoma State football notebook: Clint Chelf, J.W. Walsh in same backfield new to Cowboys coach Mike Gundy 2/38

Oklahoma State's Blake Jackson, left, catches the ball but is unable to hold on beside Deion Imade during OSU's spring football game at Boone Pickens Stadium in Stillwater, Okla., Sat., April 20, 2013. Photo by Bryan Terry, The Oklahoman