Mary Winchester is a fictional character from the television series Supernatural. She is the mother of the main characters, Sam and Dean Winchester, and is known for her tragic backstory involving the supernatural. Her life was dramatically altered when she was killed by a demon, which set her sons on a path to hunt supernatural creatures. In the series, Mary is portrayed as a strong and loving mother who is deeply connected to her family's hunting legacy. Her character is explored through flashbacks and later story arcs, revealing her own experiences with the supernatural and her role in the Winchester family history.