Mary Beth Lacey is a fictional character from the television series Murder, She Wrote. She is portrayed as a close friend of the show's main character, Jessica Fletcher, who is a mystery writer and amateur detective. Mary Beth often provides support and companionship to Jessica as they navigate various murder mysteries. In the series, Mary Beth is depicted as a warm and caring individual, often helping Jessica with her investigations. Her character adds depth to the storyline, showcasing the importance of friendship and collaboration in solving crimes. The show aired from 1984 to 1996 and remains popular among mystery enthusiasts.