Here's a full-sized pic, so not sure what it's supposed to be, exactly. Is it really a death pic? Notice his hands, and also notice how his shoulders are with respect to the inside of the mat. (you can view the image and click it to enlarge):

This picture hasn't anything to do with the death, it is a fake which some asshat has add to the news. How do you understand words "upside down"? Just about all over the world it means feet towards the sky.
I bet this is what happen: Bunch of kids rolled this sorry ass mofo inside the mat as a joke, then they get the clever idea to lift the roll standing on it's head, and leave the gym, giggling about the fun of it. Gym was closed and they didn't get back to rescue this guy, so he died. Check out the colour of this guy and what would be colour of his frends also. Do they step forward and tell what they have done? I don't think so..