Trish Troglen was asleep on the couch, when Eric Whitehead, then just 14-years-old blasted her head with a rifle.
He told investigators that he'd woken up enraged, after dreaming that he'd been arguing with the woman he described as his: "best friend."
Charged an adult, the troubled teen who had a tendency to run away an get into trouble was sentenced to life in prison with the possibility of parole, although he may be eligible for release in 30 years.
Investigators say Whitehead had a history of psychiatric problems.
Following the fatal incident he underwent two mental examinations - both found him competent to stand trial, Assistant District Attorney
Hank Syms told The Augusta Chronicle.
Whitehead's biological father said that he believed "teenage hormones and peer pressures led to all that went wrong."