En route to a 68-47 Missouri loss, the Tigers didn't make a basket for more than seven minutes in the second half, allowing Oklahoma State to build a 16-point lead.
The Cougars were placed in the eight-team consolation bracket, which will finish on Sunday.
The Cougars beat Park University 78-64 and will face Hannibal-LaGrange at 7 p.m. Tuesday at The Arena at Southwell Complex for the finals.
An NFL investigation found between 22 and 27 defensive players were involved in the program administered by Williams.
Stevenson, who played fullback from 1958 to 1960, was the first black player to accept a football scholarship at Missouri.
The contract for the Missouri women's basketball head coach's will now last through 2017.
After responding to a call about a suspected dead dog in a home's backyard, firefighters found the body of a woman and the mummified remains of a man.