Because of the lack of blood spatter at Ft. Marcy Park, Foster may well have died elsewhere and moved to the park.`
Back in the day G. Gordon Liddy, an experienced FBI investigator, said he couldn't be certain whether Foster was murdered or committed suicide because he didn't have full access to the investigation, but the one thing he was certain of was that whatever happened did NOT take place at Ft. Marcy Park. I think this was primarily because Foster had no mud on his shoes, but everyone who went to the site got their shoes muddy.
Yep. Everybody watches Forensic Files these days, and we all know about blood spatter.