SEATTLE (AP) — A 15-year-old boy accused of killing his parents and three siblings in east Seattle this week tried to blame the murders on his younger brother, but after faking his death, a surviving sister fled to a neighbor’s house. And I told the police who really did it shotsAuthorities said in a court document made public Thursday.

The boy was charged in juvenile court Thursday with five counts of aggravated murder. Under Washington state law, a hearing must be held before the case can be transferred to adult court.

The 11-year-old sister who survived Monday’s shooting told investigators that the defendant had gotten into trouble because he had recently failed exams at school and that the gun he used belonged to their father. He said that out of all the children, he was the only one who knew the code to the lockbox their father hid.

The King County Medical Examiner’s Office identified the victims as Sarah Humiston, 42, Mark Humiston, 43, and their children Katheryn Humiston, 7, Joshua Humiston, 9, and Benjamin Humiston, 13.

According to a probable cause affidavit from King County sheriff’s detective Aaron Thompson, the defendant called 911 around 5 a.m. Monday to report that his 13-year-old brother had shot and killed his parents in their Fall City home because he had broken in. The problem of looking at pornography.

Moments later, a neighbor called 911 to say the injured 11-year-old boy came to the house and said he had been shot by his parents’ 15-year-old brother and played dead before running away, the affidavit said.

Arriving deputies detained the 15-year-old in the driveway and found the bodies inside. The 11-year-old boy was treated at a Seattle hospital and later released, a hospital spokesman said.

15 year old waived his right to appear in court Tuesday, according to the King County Prosecutor’s Office. Defense lawyers told the court he had no criminal history. His lawyers did not immediately respond to a message seeking comment on the charges Thursday.

The teen is scheduled to appear in court Friday afternoon.

Mark Humiston worked as an electrical engineer at Hargis Engineers in Seattle.

“We are blindsided and saddened by the tragic events that have led to the loss of a respected colleague, mentor and friend, as well as close family members,” the company said in a statement Thursday. “Mark’s leadership and vision were an integral part of our firm and we will miss him greatly.”

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