A 15-year-old teenage male has been charged with the murder of his parents and three of his siblings after a shooting Monday (Oct. 21).

On Thursday, the teen was charged with five counts of first-degree aggravated murder and one count of first-degree attempted murder. Two adults and three juveniles were found dead early in the morning Oct. 21 at a home in Fall City.

The King County Medical Examiner’s Office identified the adults as Mark and Sarah Humiston and the children as Katheryn Humiston, 7, Joshua Humiston, 9, and Benjamin Humiston, 13. All five individuals died due to gunshot wounds. An injured 11-year-old girl was taken to the hospital Monday and has since been discharged.

The 15-year-old shooter had called 911 that morning claiming his 13-year-old brother killed the family before killing himself, according to documents filed in King County Superior Court. The police then received a call from the family’s neighbor, who gave medical aid to the 11-year-old girl. She had gone to her neighbor’s house for help after finding her family members shot and getting shot at herself, the documents said. The documents also state the 15-year-old used his father’s Glock handgun to commit the shootings.

The 15-year-old had his first court appearance Oct. 22, but waived his right to attend and was represented by defense attorneys instead. King County Superior Court Judge Joe Campagna ordered the teen to be held in secure detention and have no contact with the surviving member of his immediate family, according to Casey McNerthney, spokesperson for the King County Prosecuting Attorney’s Office (KCPAO).

McNerthney told King5 that KCPAO has not had any previous cases with this teen, which is unusual for “these kinds of allegations.”

A community support meeting will be held at 10 a.m. Saturday, Oct. 26, at Snoqualmie Valley Alliance Church. The meeting will provide information on the investigation and resources for those grieving.

This is a developing story. Check back for updates.