User blog comment:Chaos11394/Where Do the Demons Go?/@comment-18033178-20130909102057

Okay from my memory when Ruby died the first time she went to hell and claimed she had to get cozy with Lilith to work her way topside. Similar happened with Meg, when her first meat suit died on her and she later returned from again hell, leads me to believe that regually killed demons just go back into the pit.

If the demon was killed by the colt, angel sword, ruby's knife or via Sam i think they actually die, poof gone. I'm only certain that Sam's method ganks them permeantly as does the colt because Lilith had to be killed killed as the final seal and yellow eyes (Azazel) would have gotten out of hell by now if he were alive.

Also Crowley said that Lilith and Azazel were dead because he didnt underestimate those 'denium wrapped nightmares'

and that is all i can remember.