By David Madden

WEST CHESTER, Pa. (CBS) — A Chester County man charged with the brutal beating death of his girlfriend’s 3-year-old son in November 2014 plead guilty to the crime on Friday.

Gary Fellenbaum shared a West Caln Township home with girlfriend Jillian Tait, wife Amber Fellenbaum and two of Tait’s children. Those children were routinely beaten.

Ryan McMillan survived but his younger brother Scotty didn’t. A plea bargain approved by Judge William Mahon spares Ryan the pain of a trial, while sparing Gary Fellenbaum a potential date with the executioner.

“The defendant is going to spend the rest of his life in prison and he’s going to spend the rest of eternity in hell,” Chester County District Attorney Tom Hogan told KYW Newsradio.

The actual formal jail term is life plus 10 to 20 years.

The two women had both entered guilty pleas earlier. Tait admitted to third degree murder and conspiracy and was prepared to testify against her boyfriend. Amber Fellenbaum conceded to child endangerment charges.

Both will be sentenced by year’s end.