I depends if their brains are intact. If they have been shot in the head, no, he probably couldn't. If they've been dead long enough that they're rotting badly, he couldn't either. "Fresh" corpses are easiest for him to consume if he wants their memories, but if their heads are too damaged, he won't get much aside from their final thoughts, if even that.

Edit:

Also I just realized I left Roy in his CS. That was just a place holder until I figured out what his real name would be.