Kentucky man enters insanity plea after admitting to beating his grandmother to death in recorded attack

Wyatt Testerman, a 19-year-old Kentucky man, pleaded guilty but mentally ill to murdering his grandmother, Cheri Oliver, in a brutal attack that was recorded on video. Testerman entered the plea without an agreement from prosecutors and faces 20 years to life in prison. He admitted to struggling with substance abuse and experiencing hallucinations.