Even so, it's odd that there's a casing atop it.
Are you saying there is a spent casing on top of the revolver? I assume you are looking at the spot between the lower portion of the cylinder and the trigger guard? Is that not the lower frame of the gun? Just for the record, I don’t believe this guy shot himself with any of the three guns (2ARs, 1revolver) that are in close proximity to his body. I’m not saying one of those guns didn’t kill him, but he wasn’t the one pulling the trigger.