Mary Catherine Diefenbach, 85, Houtzdale, died Sunday at Mount Nittany Medical Center, State College. She was born in Johnstown, daughter of the late Claude and Mary Ann (McQuillen) Diefenbach. Surviving are three nephews: Donald, Larry and Daniel Diefenbach. She was preceded in death by a brother, Donald Diefenbach. At Mary's request, there will be no public visitation or service. Interment will be in St. Lawrence Cemetery. Arrangements are by Birger A. Freeberg Funeral Home Inc., Houtzdale.