WARRINGTON TOWNSHIP â€“ Police in York County are investigating a murder-suicide Thursday in Warrington Township. Police said 57-year-old Donald Cassel, Jr. killed his mother, 81-year-old Shirley Westheafer. and then took his life. It happened in a bedroom at a home on Rocky Wood Lane around 2:20 p.m. Police said Cassel’s wife was home at the time and called police. A motive is under investigation.