A 17-year-old Columbus boy will serve 15 years in adult prison after pleading guilty Thursday to his role in the slaying of his accomplice during a robbery attempt. Prosecutors say Devon Jackson is one of three people who robbed a Lilley Avenue apartment last September. Prosecutors say the apartment's occupant wrestled a gun away from Jackson and 21-year-old Talia West was shot and killed. 23-year-old Anthony Jones is scheduled for trial later this month.