LOWER OXFORD TOWNSHIP, Pa (CBS) – Pennsylvania State Police and Chester County Detectives are investigating the stabbing death of an 81-year-old woman.

Authorities say the homicide happened at approximately 2:25 a.m., Tuesday morning, on Irwin Road. Police say the woman was stabbed by a family member.

A suspect is in custody and all of the other family members have been accounted for.

Anyone with information is asked to contact the Pa. State Police, Avondale Barracks, at 610-268-2022.