In mythology, there were multiple things that had to be done to insure that a vampire didn't return. Beheading was primary among these. As was a steak through the heart. This was to actually pin the body to the coffin so it couldn't rise. They also took the head and stuffed it with garlic and buried it in holy ground away from the body. In Dracula, they decapitated him AND put a bowie knife through his heart, then the body turned to dust.