Warren Pennick of Lansdale pleads guilty, but insane

He stabbed his mother to death on Halloween

Published: 5:30 PM EST Jan 14, 2014   Updated: 8:04 AM EST Jan 15, 2014
Warren Pennick pleads guilty to killing mother
NORRISTOWN, Pa. -

Warren Pennick of Lansdale pleaded guilty but mentally ill to third degree murder in Montgomery County Court Tuesday.

Assistant District Attorney Jordan Friter reported 55-year-old Pennick was sentenced to 20-40 years in prison for the Halloween 2012 slaying of his mother.

Investigators said Pennick repeatedly stabbed his 79-year-old mother, Lorraine Pennick, and slashed her throat in their Lansdale home before leaving the 7-inch knife on her chest, changing clothes and walking to the police station to confess.

Pennick's attorney said his client has suffered since childhood from paranoid schizophrenia and delusions.