It happened around 10:15 PM local time yesterday at Irving Plaza, near Manhattan's Union Square.
Police said a 34-year-old man was shot in the chest and a 33-year-old man was shot in the stomach. One of the men later died at a hospital, police did not say which one.
A 26-year-old woman was shot in the leg. Police said a fourth person walked into a hospital on their own.
Elijah Rodriguez was attending the concert with his sister and they were in the VIP area by the stage.
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"All the sudden I heard someone saying that there was a shot, that someone got shot," Rodriguez said.
Rodriguez didn't actually hear the shots himself, but heard people saying that someone had gotten shot.
"It was scary to deal with. When I got outside, like literally across the street, there were a few girls having, like, panic attacks. One girl thought she saw someone get shot in front of her," Rodriguez said, adding that TI was not onstage when the shots were fired.
Representatives for TI, whose real name is Clifford Joseph Harris Jr, said they were referring all questions about the shooting to police.
No arrests were made. No other information was immediately available. Irving Plaza is a 1,025-person ballroom-style music venue.