It sounds like a "just show up" dance hall. So a witness could see him leave based on the description of clothes he was wearing (or notice his height), and not know either him or the identifies of the three others. I'm likening it to seeing a group of kids at a movie theatre, you might notice some detail - "one guy had a mohawk" - but you wouldn't know them or have a reason to look twice. Seeing as he said he had a ride home, how did he get there? It sounds like those same three may have brought him there. Maybe they went out drinking and he passed out in the woods, they left him and he died of hypothermia on an October night in the northeast. Or, he truly looked out of place and it was a robbery gone bad. Bloomfield is a nice community, but Hartford has some rough areas, and did then.