Defense attorneys for a 15-year-old accused of killing five family members at their Fall City home are requesting more time to prepare for a critical court hearing, citing the case’s complexity and allegations of severe family dysfunction.
The teen faces five counts of first-degree murder in the October 2024 shooting deaths of his parents, Mark Humiston, 43, and Sarah Humiston, 42, along with siblings Katheryn, 7, Joshua, 9, and Benjamin, 13. An 11-year-old sister survived by fleeing to neighbors and calling 911.
The killings occurred late at night while family members slept, according to court documents. The accused initially told emergency dispatchers that Benjamin had committed the shootings and killed himself.
Defense lawyers filed a motion July 22 requesting a delay in the decline hearing, which determines whether the juvenile will be tried as an adult. They argue they need until April 2026 to interview 98 potential witnesses, having spoken with only 22 so far. Forensic evaluations could extend through August 2026.
Court filings describe the Humiston household as isolated and controlled by extreme religious beliefs and distrust of government and medical institutions. The children were homeschooled with limited outside contact, creating what attorneys call a “rigid, militant, and survivalist” environment.
The boy’s maternal grandmother reportedly told investigators that Sarah Humiston was “abusive and demeaning” and that she had considered calling child protective services. Extended family and neighbors allegedly raised concerns about the children’s upbringing.
Defense attorneys maintain the teen was previously described as “kind, respectful, and deeply devoted” to his family. They argue the family’s psychological dynamics and alleged abuse are crucial to understanding the case.
Prosecutors contend that while the defense timeline may be relevant for trial preparation, it’s unnecessary for the decline hearing, which focuses on whether juvenile court is appropriate rather than examining guilt or innocence.
A status conference is scheduled for September 2025 to determine whether the hearing will be delayed into 2026. The case continues to impact the small community east of Seattle.
