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

Brian Rebold, 40, pleaded guilty but mentally ill to one count of first-degree murder in the August 2024 stabbing death of his mother, Diana Rebold, on Liberty Avenue in Arnold. Neighbors witnessed the incident and officers found the victim unresponsive in the street; she was pronounced dead at the scene. Sentencing is scheduled in 90 days and carries a mandatory life-without-parole term; Rebold will undergo a mental health evaluation and the judge may order psychiatric treatment at a secure state hospital prior to incarceration.