Mary Beth McDonough: Mary Beth McDonough. Actress: The Waltons. Mary Beth McDonough was born on 4 May 1961 in Van Nuys, California, USA. She is an actress and writer, known for The Waltons (1972), Mortuary (1982) and Impure Thoughts (1986). She has been married to Don since 4 June 2011. She was previously married to Rob Wickstrom.