Arnold man pleads guilty but mentally ill in mother's fatal stabbing

Westmoreland County prosecutors say 40-year-old Brian Rebold pleaded guilty but mentally ill to a single count of first-degree murder for the August 2024 stabbing death of his mother, Diana Rebold, on Liberty Avenue in Arnold. Rebold called 911 and neighbors witnessed the incident; the victim was found unresponsive in the street with multiple stab wounds and pronounced dead at the scene. Sentencing is set for 90 days with a mandatory life-without-parole term, and Rebold will undergo a mental health evaluation to determine whether he should begin treatment at a secure state hospital before entering corrections.