a 15 year old washington state The boy accused of killing his parents and three siblings allegedly tried to frame the scene as a murder-suicide committed by his younger brother.

According to court records, the suspect’s 11-year-old sister survived Monday’s attack by playing dead and told police what really happened, the Associated Press reported. New details were made public Thursday about the massacre at the Humiston family’s home on the shores of Alice Lake in Fall City. East of Seattle.

The girl told police that her 15-year-old brother used his father’s gun, and that his brother was the only one of his siblings who knew the code to the lockbox where his father’s gun was kept.

He told police that his brother had recently gotten into trouble for failing exams at school.

WASHINGTON TEENAGER ACCUSED OF MURDERING HIS FAMILY WAS BANNED FROM CONTACTING HIS SURVIVING SISTER

Mark Humiston, 43, and Sarah Humiston, 42, were identified by the mentor of one of their children. (Facebook/Mark Humiston)

The King County Medical Examiner’s Office identified the victims as Mark Humiston, 43; Sarah Humiston, 42; and their children, Benjamin, 13; Joshua, 9; and 7-year-old Katheryn, according to the Associated Press. Authorities did not release the suspect’s name.

The suspect called 911 around 5 a.m. Monday to report that his 13-year-old brother had slaughtered his family after getting in trouble for looking at pornography, according to the probable cause affidavit, according to the Associated Press.

After the surviving girl ran away, a neighbor called 911 and told what happened. Police learned that the injured girl, who was shot twice, was helped by a neighbor with medical experience, and she escaped and ran to the neighbors.

He was taken to Harborview Medical Center and released from the hospital Tuesday night, a hospital spokeswoman said. Seattle Times.

Deputies discovered a “chaotic scene” when they arrived at the home Monday but immediately took a male juvenile into custody, King County Sheriff’s Deputy Mike Mellis said at a media briefing.

When deputies entered the home, they found five people dead: the bodies of two adults and three children. When the bodies were found, deputies realized it was an incident. “a major crime scene” Mellis said.

WATCH: Drone footage shows lake where teenager allegedly killed family

The suspect was charged Thursday with five counts of first-degree aggravated murder and one count of attempted first-degree murder armed with a firearm, all of which fall under domestic violence, the King County District Attorney’s Office said. He remains in secure custody at the Clark Juvenile and Family Justice Center.

The case was initially filed in juvenile court due to the suspect’s age, but prosecutors said they requested a hearing from the judge to decide whether the case should be moved to adult court.

The suspect’s lawyers told the court he had no criminal history, according to the Associated Press.

The judge also ordered the teenager to have no contact with his surviving sister.

YOUTH IN WASHINGTON STATE WAS TAKEN INTO CUSTODY AFTER SHOOTING HIS HOME, KILLING 5 OF 7 FAMILY MEMBERS

While a young man was taken into custody, a girl injured by a bullet was taken to the hospital. Deputies found three more juveniles and two more adults dead at the scene. (FOX13 Seattle KCPQ)

“I only saw the kids in the driveway yesterday afternoon,” neighbor Lynne Trowern said he told Fox 13. “I was shocked. I kept bursting into tears.”

Neighbors told the press that the five children could be seen swimming, fishing and boating on the beach at their lakeside home all summer long.

“He’s very polite. He was home-schooled. It’s incomprehensible what happened,” a former neighbor said.

“My father worked hard, and my mother was the most dedicated, loyal mother you could ask for,” said Rhea Robertson, a soccer coach who mentored one of the victims. KOMO News. “You thought they were perfect. They looked perfect to me from the outside.”

NAVY NAMES 2 CREW MEMBERS KILLED IN WASHINGTON STATE JET CRASH

The attack occurred early Monday in the Lake Alice neighborhood of Fall City, Washington. (FOX13 Seattle KCPQ)

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“This appears to be a domestic violence incident involving a young man in serious trouble and involving firearms,” ​​Mellis said.