It happened at the 32nd Street Pub at 32nd Street and Allegheny Avenue around 12:45 a.m. Friday.
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Witnesses say the gunman and the 33-year-old victim were talking inside, then the victim walked out a side door to leave.
The gunman came up behind him, shot him in the head and neck, then fled in an SUV.
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Officers rushed the victim to the hospital, but they're not sure if he'll survive.
Police say the shooter was wearing a pink or light-colored baseball cap and possibly a green jacket.
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