Last I checked, he was still alive when Goku killed Kid Buu, since he was clearly revived with the rest of Earth's inhabitants and obviously with the rest of Cell's victims earlier.
Are you referring to Dragonball GT? The original 17 was no longer evil, he was brainwashed, and helped Goku and 18 destroy him as Super 17, so he would have been wished back along with Krillin at the end.
Or are you referring to 17 of the future, killed by Trunks? If so, why isn't 18 listed under Deceased Villains? 188.8.131.52 02:00, June 16, 2011 (UTC)