@noonan As a REALLY big spoiler (turn away here to avoid seeing it)…
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… it turns out a main character in the TV show is the past killer who got away with it and is being set up by that framed killer in the current timeline as a result.
Weird choice to make a main character a serial killer in a series opener, because plhe won’t be in the rest of the series. But he’s a regular in the TV show (and it feels better to me that way).