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Rex Stewart was the son of John Stewart and Shayera Hol. As the hero Warhawk, he joined the Justice League Unlimited.
Warhawk was, at first, not impressed when Superman brought Batman into the JLU to seek out who had ambushed Micron. This only worsened when Batman could only barely prevent an assault on Aquagirl. But Warhawk was not stupid - he knew that whoever betrayed the JLU would come after him at some point. Warhawk remotely operated his armor into battle, and let the traitor destroy the armor.
Warhawk eventually helped Batman uncover the real traitor - a Starro-controlled Superman.
He was voiced by Peter Onorati for most of the character's appearances and by Marc Worden for the episode "Epilogue".