April 24th: Constance Welch accidentally drowns her two children, ages 5 and 6, killing them. Overwrought with guilt, she commits suicide by leaping off Sylvania Bridge to her death. Constance's ghost becomes a "Woman in White" haunting a five-mile stretch of road on Centennial Highway in Jericho, California.
November: The demon Azazel breaks into the nursery of the Winchester home and feeds infant Sam some of his blood. Mary Winchester discovers him and Azazel kills her and sets the house on fire. John manages to escape with his sons, but the incident sparks a lifelong obsession with tracking down the demon who murdered his wife.
June: Sam and Dean seek guidance from their father's old friend, Bobby Singer. Bobby teaches them about devil's traps and they use it to capture Meg. Sam exorcises her, but Meg's human host dies from previously sustained injuries.
October 29th: The witch Tracy Davis places a hex bag in the home of the Wallace family as part of a blood sacrifice designed to summon the spirit of Samhain. Luke Wallace consumes a piece of candy and begins choking on razor blades, which ultimately kill him.
October 30th: The witch Tracy Davis places a hex bag in the home a teenager named Justin as part of a blood sacrifice designed to summon the spirit of Samhain. Justin hosts a Halloween party that night and Tracy is in attendance. Her friend Jenny goes dunking for apples and is killed when the water in the tub begins boiling and she cannot free herself. (Supernatural: It's the Great Pumpkin, Sam Winchester)
October 30th: Castiel and Uriel threaten to smite an entire town to prevent the witch Tracy Davis from conjuring Samhain, thus breaking one of the 66 seals. Sam and Dean try to stop her, but she completes her ritualistic blood sacrifice and Samhain rises. Samhain begins raising legions of the dead, but Sam uses his power to exorcise Samhain's spirit from its host body, sending it back to Hell. (Supernatural: It's the Great Pumpkin, Sam Winchester)
↑The actual date is supplied on Jessica's tombstone in "Wendigo"
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