Yes
Yes, Jeff Bezos is still alive
No, Jeff Goldblum is still alive.
As of December 2013, LeVar Burton is still alive.
Yes.
Tim Burton is still alive
Yes.
No-but his underpants are
Yes, he's still very much alive and directing movies.
No, he's still alive........
NO still alive...read much?
Jeff the Killer was just a made up story on creepy pasta. If you're asking if the story is still alive, then yes, people still talk about Jeff on occasions.
No, Jeff Kinney is alive. He is the author of the "Diary of a Wimpy Kid" series and is still active in the literary world.