Gregory was sitting in the driver's seat of his mother's car about 10:30 p.m. on Wunder Street near Cotton Street.
He turned the ignition, and two gunmen jumped out of an alley, fired and ran east in the alley.
Police later learned they fled on a motorcycle.
More than 15 spent shell casings from two handguns were found at the scene.
Police also found more than 60 packets of marijuana packaged for sale in the car.
Gregory is believed to have been targeted because he was in the illegal drug trade.
Police still hope to make an arrest.
Cold case: Reading man was slain in tense summer of 2001
Report dated 8/18/2008
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