A Washington teenager accused of killing his parents and three of his siblings called 911 afterward and told authorities one of the victims carried out the grisly attack before killing himself, according to court documents.
Around 4:55 a.m. on Monday, 15-year-old Andrew Humiston called the King County Sheriff’s Office and claimed his 13-year-old brother “just shot my whole family and committed suicide, too,” according to a probable cause statement obtained by NBC News. When deputies arrived at their $2 million residence in the Lake Alice neighborhood of Fall City— one of the most expensive in the country — t hey found Mark Humiston , 42, fatally shot alongside his wife, Sarah, and three of their children, ages 7, 9 and 13.
Deputies also discovered a sixth victim, the suspect’s 11-year-old sister, on the scene suffering from a gunshot wound. She later told them Andrew lied during his emergency call in a bid to blame their brother for the carnage. She further maintained that Andrew was the one who gunned down their family, using their father’s Glock handgun, which is typically kept in a lockbox. She added that Andrew was the only one of them who had the combination for it, according to the documents.