Investigators say 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 17-year-old Clayton Watts waited with two friends for his grandparents to come home Tuesday evening, then ambushed 59-year-old Jimmie Paul and killed her with three gunshots in the chest.

Deputies say 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 say the grandson, along with 19-year-old Shaderius Cohen and 18-year-old Marquaes Buchanan, are all charged with murder and will be prosecuted as adults. Murphy didn't know if the suspects had attorneys.