According to the report, Park did not arrive with the team in Norman this afternoon.
But while Lanning made big plays on both sides of the ball, it was Kempt who made the final big offensive play, hitting Allen Lazard on a fade route with 2:19 remaining to put the Cyclones ahead for good.
Lanning played quarterback last season before transitioning to inside linebacker during the offseason after Park won the job. Baker Mayfield passed for 306 yards and rushed for 57 the Sooners (4-1, 1-1), but his Heisman hopes and Oklahoma's College Football Playoff took major hits.
Iowa State came into this game on 0-17 skid against ranked opponents, dating back five years and a day since they visited No. 15 TCU and beat the Horned Frogs 37-23.
"There's been a lot of adversity at Iowa State for a long time and there's been a cloud around us", Cyclones coach Matt Campbell said.
Iowa State: LB Joel Lanning.
Through the season's first month, Oklahoma looked like a sure bet to play in the title game and was pointed toward the CFP.
Going into Saturday's game against No. 3 Oklahoma, Iowa State's redshirt senior quarterback Kyle Kempt had thrown two passes in his career.
Iowa State rallied to tie the game in the second half.
Following Oklahoma's Week 2 win at Ohio State, Mayfield placed an OU flag on the Buckeyes' midfield logo.
Oklahoma running back Abdul Adams left the game in the first quarter with a right leg injury and did not return to action. The Sooners play Texas in Dallas.