(Johnston, IA) -- A teen accused of assaulting a local woman who later died, is now charged with 2nd Degree Murder. Johnston Police say 15-year-old Jovahn Mathis, who lives at the Ellipsis Youth facility on NW Beaver Drive in Johnston is in custody. He's accused of assaulting 50-year-old Ellipsis employee Kathleen Galloway-Menke May 8th. She died of her injuries May 14th.