Mary Elizabeth McDonough is an American actress, best known for her role as Erin Walton on The Waltons from 1971 to 1981. In 1988, she married Rob Wickstrom, with whom she has a daughter, Sydnee. The couple divorced in 1996. She suffers from lupus erythematosus, caused by leaking silicone breast implants. In the 2000s, she returned to television, gueststarring on Boston Legal and The New Adventures of Old Christine. McDonough is a radio guest and has been on international and syndicated shows such as Get Focused Radio with Kate Hennessy. She can be seen on the internet on the show Mcdougall M.D. as part of the broadcasts on the TBN network.