OKLAHOMA CITY -- Donnie Duncan, a former Oklahoma athletic director and Iowa State football coach, has died at the age of 75.
Son-in-law Patrick Reardon says Duncan, who suffered from cancer, died in his sleep Saturday in Dallas.
Duncan was on Barry Switzer's Oklahoma football staff from 1973-78, and he helped the Sooners go 62-6-2.
He went 18-24-2 in four seasons at Iowa State. His 1980 and 1981 Cyclone squads were ranked, and the 1981 Cyclones began 5-1-1 and were ranked as high as No. 11 in The Associated Press poll. Duncan's squads went 3-1 against Iowa, including three straight wins in 1980, 1981 and 1982.