How can I tell if something died naturally ?

A little bit of context, I had recently moved into a new apartment and I was scoping out the place when I noticed something out near the clothes line, turns out it was a rabbit skeleton. It's fully decomposed and it's nothing but bone but I was wondering how I could tell if it died naturally, or if it was killed for some unethical reason. Mostly wondering because I wanna keep the bones, and don't want any bad vibes in my new place. [Pics will be provided if needed]