Not a bad episode (I didn't fall asleep while watching as it is happening lately with CSI and other shows), but a little bit silly.
I understand that this is the idea, to make a silly, goofy episode, with the team having fun at work, but it would have been nice if the viewers would have had some of that fun too.
I found the cycle idea a bit confusing. At first I thought that the next death should be natural to make the cycle, not that there should be one during the shift. That kept me distracted a while.
As soon as Kevin appeared I knew he was going to be the natural death. A good touch would have been that he wore a red shirt, Star Trek style.
So, that's all folks