A Holts Summit teen, accused of killing his grandmother will undergo a mental evaluation to see if he's competent to stand trial. During a case review Monday at the Callaway County Courthouse, Judge Kevin Crane gave the State Mental Hospital an additional 30 days to complete an evaluation for Ryan Koebel. Koebel, 19, is charged with first degree murder, four counts of armed criminal action, and three counts of assaulting a law enforcement officer. In January 2012, the teenager told officers he got into a fight with his grandmother, Karen Cates, and during the argument shot and stabbed her several times, according to court records. Cates died at her home in Holts Summit. After the murder, Koebel was spotted walking along Highway 54 in Callaway County toward Jefferson City carrying a gun. As troopers and Holts Summit police officers attempted to make contact with him, they say Koebel pointed at gun at them and started firing. That's when the highway patrol trooper hit Koebel with his cruiser. Koebel was then taken into custody. Koebel's jury trial is scheduled to begin May 14.