Edward Mallory (b. Edward Ralph Martz on June 14, 1930, Cumberland, Maryland - d. April 4, 2007, Salisbury, Pennsylvania) was an American actor, best known for his role as Dr. Bill Horton on NBC's soap opera Days of Our Lives, which he played from 1966 to 1980.Mallory once was married to actress, Joyce Bulifant, and was married to Susanne Zenor at the time of his death; Zenor played Margo Horton on Days of our Lives.