The Lyle and Erik Menéndez Story,' says reaction to his nude scene has been 'shocking.' He's stripped down before.

Koch had to bare it all for a scene in “Monsters,” which follows the story of Erik and Lyle Menendez, who murdered their abusive parents in 1989 and were sentenced to life in prison in 1996. During Episode 3, Koch’s Erik is showering naked in jail and turns toward another inmate to show him — and the camera — his penis.