Place: Mostly United States, but any place with a parks system or where camping is a common recreation.
Search Terms: Serial Killer+ park, campground, impersonating police.
I'm looking for cases that I can read up on or have characters refer to. So far I've found Cary Stayner who killed four women in Yosemite, Ivan Milat, the backpack killer in Australia and Herbert Miller, the Trail side killer.
I haven't been able to track down any cases where the killer impersonated law enforcement to lure away victims, but it feels like there should be some.
Can anybody think of other campground or park killers or any police impersonators?