Mary Jo O'Donald, 81 of Wilmington passed away on Saturday May 2, 2020 at Christiana Hospital. Mary Jo was born in Lebanon, PA the daughter of the late Mary (Uhrich) and William Koster. She worked as a secretary for the DuPont Company for 39 years and was an active member of St. John the Beloved Church. Mary Jo loved the beach, but her real passion was square dancing and she belonged to many clubs including Castle Squares, Red Clay Garden Club and Newark Charitable and Social Club. Her husband, Thomas D. O'Donald, Jr. passed away in 2005. Mary Jo is survived by her son, Thomas D. O'Donald, III and his wife, Betsy of Wilmington and her grandchildren, Fr. Thomas D. O'Donald, IV of Philadelphia, PA, Jeannine O' Donald and Danny O'Donald, both of Broomall, PA. Funeral services will be private. In lieu of flowers, contributions may be sent to Heartland Hospice Care, 750 Prides Crossing Suite 110, Newark, DE 19713.