Cassidy has mostly been a mystery in Preacher so far.
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As has the race of vampires in general.
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However, season 4 finally delved into Cassidy's backstory.
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Fighting the Irish Republic in 1916, Cassidy leaves his friend to die.
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On the run, Cassidy gets stuck in a swamp and attacked by a vampire.
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This is mostly the same as Cassidy's origin in the comic books.
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And provides a reason for the character's self-destructive behavior.
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