Season 4, Episode 15:
Death Takes A HolidayWhen people stop dying even after fatal accidents or illnesses, Sam and Dean head to investigate and discover that the local Reaper is missing. They figure out that killing two reapers is one of the 66 seals, and get Pamela - the blind seer- to turn them into ghosts, so they can try warn the reapers and stop them being killed.As ghosts, they meet Cole, a kid who was meant to be taken by the reaper but got left behind when it was kidnapped. He teaches them how to fight and disappear in a quick training montage.Tessa, Dean's Reaper from series two also appears.Finally the boys track down the demons. It was Alastair, and he manages to kill one of the Reapers, but the boys save Tess.In the real world, Pamela gets attacked by a demon, who stabs her. She manages to bring Sam back, and he deals with the demon. Pamela can't die however, because Tess still isn't reaping.Castiel appears to Dean, and tells him they finally had a victory. Cole moves on to the afterlife, and because Tess is reaping again, Pam just has time to bring Dean back before she dies.
Body countFor this episode = 3 humans, 1 demon, 1 ghost, and 1 reaper.For the series so far = At least 289 humans (of which 5 were witches), at least 62 demons, 27 ghosts, 10 vampires, 6 changelings, 3 gods, 3 shapeshifters, 3 zombies, 2 werewolves, 1 cat, 1 crocotta, 1 djinn, 1 dog, 1 rakshasa, 1 rawhead, 1 reaper, 1 rougarou, 1 shtriga, 1 siren, and 1 wendigo.