A raccoon. Within the ecosystem of the dumpster (bacterium, maggot, cockroach, mouse, rat, freegan, raccoon), the raccoon or dumpster shark is the apex predator. It takes only a small amount of decomposing food or garbage to attract these animals, who can seemingly detect the odors from this kind of waste from kilometres away. Sometimes traveling in large groups but typically cruising solo, larger specimens may pose a threat to humans and pets.
Just toss that chopped up body behind the 7-11. The dumpster sharks will take care of the rest.