COLUMBIA, S.C. — Investigators said a South Carolina teen offered to pay his friends $5,000 to kill the grandparents who raised him because they were too strict.

Chester County Sheriff’s Maj. Bill Murphy said Clayton Watts, 17, waited with two friends for his grandparents to come home Tuesday evening, then ambushed Jimmie Paul, 59, and killed her with three gunshots in the chest.

Deputies said the suspects also planned to kill the teen’s grandfather, but he went to work on his boat in a shed and didn’t come inside. He found his wife’s body a few minutes later and called 911.

Investigators said the grandson, along with Shaderius Cohen, 19, and Marquaes Buchanan, 18, are all charged with murder and will be prosecuted as adults.