Fallout 3 question- Canterbury Commons?

Alright, so I've been doing a re-run through Fallout 3 while I wait to get New Vegas. I started the quest "Superhuman Gambit", and went to find the Mechanist for the speech-check ending. I got his armor and then went on my merry way back to Canterbury. When I arrived there, it was deserted. Only the robots were left. I searched around and managed to find Uncle Roe dead about 200 yards away. The town was devoid of bodies, the brahmin untouched. There was nobody else in sight. I found a robobrain nearby with reduced health, which I suspect was the killer. I guess my question is- can I still receive my payment? Everything in town is still owned(beds not able to sleep in, items red). Is there a place where the residents might have fled to?