The victims were the mother and sister of 27-year old Casey Eaton, who was seriously wounded and left for dead. She was involved in a custody battle with Giles over their 9-month old baby girl. Authorities say Giles also pleaded guilty to attempted first-degree murder for the attempt on Casey's life.
At the time of the murders, Giles was a Marine recruiter in Centralia. As part of the plea deal, charges of solicitation, home invasion, aggravated battery with a firearm and aggravated cruelty to animals were dismissed.
Authorities say Giles tried hiring a fellow inmate to kill Casey after his arrest. He's scheduled to be sentenced April 4.
Giles' sister, 23-year old Katrina Giles, is being held on $2 million bond. She faces first-degree murder and other charges for allegedly helping her brother prepare for the attack and attempt to establish an alibi. She's due in court March 13.
Copyright 2015 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.