Judjing from the fact that blood is tricling down the left side of his body, I would guess that he was lying on his left side when the last knife was thrust into his body. So he was alive, probably screaming something, and the killer was kneeling on top of him, and thrust the knife in. Blood spurted out and trickled down the back, he dies and then just lies flat face down.
I'm sure the stabber was quite satisfied with his work.