Crowley's (Mark Shepperd) backstory in Supernatural, specifically how and when he died and became a demon, is largely alluded to throughout the show but ultimately amounts to a series of particulars.
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Mark Sheppard was the devious demon Crowley (who was born a Scottish lad named Fergus MacLeod) who eventually ascended to the crown of Hell, while sometime allying with Sam (Jared Padalecki) and Dean ...