KING COUNTY, WA (AP) – A 15-year-old boy is facing murder charges in the shooting deaths of five family members at his home east of Seattle.

The King County Prosecuting Attorney’s Office said on Thursday, Oct. 24, that the teen was charged with five counts of aggravated murder and one count of attempted murder in connection to Monday’s shooting.

Court documents state that the boy tried to pin the killings on his younger brother, but his 11-year-old sister who survived the shooting after playing dead told police that wasn’t true. She told investigators that the boy had recently gotten into trouble for failing tests at school and that the handgun he used belonged to their father.

The girl claims he was the only one who knew the code to the lockbox their dad kept it in.

The hearing has been ordered for June 4, and the teen will enter a plea at that time.