Agree, he wanted her reamins found.
Interesting thought that the killer possibly was expecting a teenage "audience" at a known spooky location where they hang out.
If that is the case then the killer must have local knowledge of that area, maybe even have some connection to those teenagers who frequent that spooky location.
An alternative could be artistic people who use the area for photo, film, painting etc.
On Vimo there is a B/W short experimental film of that exact area, made by pupils from Dever Film School:
Pattridge Park on Vimeo
By the way, was the killer/killers in the Criminal Minds episodes a photographer? or did he just take pictures of his crimescene?
maybe jessica's killer saw that/those episodes? and got inspired?
Do you have a link to any of those Criminal Minds episodes? or know what they were called? or when they were broadcasted?