Ghost under the railway bridge near Valentine?

You know that little railway bridge to the south of Valentine, the one where you find those mangled bodies? I was just there since my Stranger encounter alert went off, I investigated and I heard someone say "Hey!", I was the only one there, there wasn't anybody else around. Could it be an easter egg of a ghost of one of the victims? Victims of murders and such are often said to haunt the place they died.