I mean, parosites is a possibility, but it begs the question, why? Did they encounter something? Why were their bodies left in that state? That only serves to draw attention if they were researching something in secret, additionally, many of the party were students & some very notable in their fields, it just doesn't make much sense for them to be executed, they wouldn't have taken them for cuns.
Unlike you, I can actually get money by doing this