More on the story of the Brooklyn army veteran who was killed by an undercover cop during a drug sting in Clinton Hill. The Daily News now reports that the "undercover cop was wearing earphones to keep in touch with his NYPD team and didn't hear an irate Brooklyn homeowner's command to get off his stoop until it was too late...When the undercover officer didn't budge from the Clinton Hill stoop Saturday night, resident Shem Walker kicked the man he thought was a vagrant in the back of the head, sources said." One source said, "With the earphones on, the cop just didn't hear anything. The next he knew, someone had kicked him, and the fight starts, with a tragic end." The police have contended that Walker grabbed the cop's gun; some witnesses say they didn't hear the cop identify himself as a police officer.