Justice League: A Better World
During the events of the Thanagarian Invasion in 2004, the hero known as Hawkman was the only one to oppose the alliance with Thanagar because he was a former Thanagarian Hawkman police and knew they were bad news. He was declared a villain by the Justice Lords. He was right but killed during the event.
DC HEROES RPG 3rd Edition p.163
DC Wikia entry