Well, I know what happens when you die.
Your body shuts down, with your brain being the last organ (unless the cause of death is linked to severe brain damage) to go, slowly shutting off every single process your body went through when it was alive. Don't worry, you usually don't feel that because technically, you are already dead.
Blood stops flowing because your heart stops. Your body evacuates any waste it had built up (urine and feces included).
After about half an hour, rigor mortis kicks in, and having someone else close your eyes takes a level in extreme difficulty. This also stops you from being completely dead weight, becoming the stiff zombie-like posture we all recognize, minus the arms hanging outward (...usually).
When all is said and done and assuming you weren't cremated or moved to a completely sterile environment immediately after death, you will rot away slowly as food for the worms, fungi and flies. All that will be left in the end is your skeleton.
As for what happens after you die, as in concerning your consciousness and "soul" of sorts, hell if I know.