Hawkman's not dead. He came back in Justice League United, via the Nth metal, just a few issues after he was killed. After the Byth arc wrapped, he left the team. He appeared in an issue Bat-Mite since then (#2, I think), as well as made a very minor (and completely superfluous) cameo in Harley Quinn #20.
No one could be more upset by this than me, by the way. Honestly, my enthusiasm for DC as a whole has severely dropped since Hawkman's gone M.I.A. They really need to get on the ball and do something with him again already. If it weren't for the CW, I'd have nothing Hawkman-related to look forward to right now.