Cassiebsg, the missing scout was mentioned in Chapter 6:
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"The victim is Daniel Wiseman, the guy from California whose blood we found on the shredded material. Single guy, no kids. From what we've been able to gather in the short time since we found his remains, he worked as some kind of freelance location scout for various Hollywood productions. He was staying at an AirBNB not far from the graveyard where his body was found. We searched his room and found some documentation linking him to what appears to be the same production as the other victims, but unfortunately the place was in a ransacked state when we arrived so the... ugh... killer probably made off with a lot of the important stuff to cover their tracks