Sylvia A. "Sis" Mock, 67, Altoona, passed away Tuesday unexpectedly. She was born in Altoona, a daughter of the late William Robert and Mary Elizabeth (Bowman) Mock. She is survived by a sister, Donna Halfpenny, of Altoona; a brother, Edward W. and wife Sandy, of San Pedro, CA; and several nieces and nephews and her cat Buddy. Sylvia was a graduate of Altoona High School, Class of 1966, Mount Aloysius College, Class of 1985, and the Computer Learning Network, Class of 1999. She enjoyed crafts and sports, fishing and baseball. At the request of the deceased, there will be no viewing or service. Arrangements by Mauk and Yates Funeral Home, Inc.