"Our goal is to always work as quickly and thoroughly as possible to assist our members,” NCAA spokesman Erik Christianson said. "This was a tragic situation, but we're glad we could assist the family and the institution.”
Mitchell, 17, was on his way to Westfield for a football scrimmage on Aug. 24 when a fight broke out between Mitchell and 19-year-old Emile "Rusty” Lewis over ownership of a dog, according to police.
Police said Lewis went to his apartment and returned with a rifle, shooting Mitchell several times and killing him.
Police have arrested Lewis and charged him with murder.
Oklahoma coach Bob Stoops received an additional waiver from the NCAA to visit Mitchell's family, which he will do today.
Mitchell's funeral service will be held Saturday at Windsor Village United Methodist Church in Houston.