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Friday the 13th - timeline
Thursday 13th June: Jason Voorhees born.
Thursday 13th June: Jason Voorhees is born.
July: Jason Voorhees purportedly drowns in Crystal Lake when the counselors are having sex - no body is found.
Friday 13th June: Two Camp Crystal Lake counselors are mysteriously murdered.
Friday 13th June: Pamela Voorhees kills numerous people at Camp Crystal Lake, a summer camp for children, while it is being renovated. (Camp Crystal Lake, Crystal Lake)
Saturday 14th June: Mrs Voorhees is decapitated in the early hours by the only survivor of her murderous rampage.