COLUMBIA, S.C. (AP) -- Investigators say a Chester 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, shooting her three times in the chest.

Deputies say the men 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 Watts, along with 19-year-old Shaderius Cohen and 18-year-old Marquaes Buchanan, are all charged with murder. Murphy didn't know if any of the suspects had attorneys.