Sam Winchester was born on May 2, 1983 to John and Mary Winchester in Lawrence, Kansas. He is the couple's second child, four years younger than his older brother Dean. When Sam was exactly six months old, on November 2, 1983, his mother, Mary, was killed in his nursery by the Yellow-Eyed demon, Azazel. Mary walked in on Sam's nursery while Azazel was feeding the infant demon blood to turn him into one of the special children. He has developed slight mental trauma due to this day and doesn't like Halloween.