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Eric O'Grady was a former employee of Pym Tech. During an event that Hank Pym and Janet Van Dyne were holding at the Pym Tech Building, fellow employee Elihas Starr, created a chemical explosion which killed Grady and a couple other employee's. Starr, being fired and angry at Pym, took Grady's remaining DNA and created Black Ant, a life-model decoy of Grady.