Morganton, in Fannin County, is located near Blue Ridge about 100 miles north of Atlanta.
The teens were arrested later Tuesday, according to the Fannin County Sheriff’s Office. They will be housed at a youth detention center.
Dickey and Hill, who are friends, knew the victim, GBI spokeswoman Nelly Miles said.
There were no signs of forced entry into the house, she said.
The suspected motive "is part of the active case and not being released at this point," Miles said.