It happened around 10:15 p.m. Wednesday (local time) 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. He said TI was supposed to go on stage at 9 or 9:30 p.m. but "he never showed up." At or around 10 p.m. he said the venue started playing music again, and at about 10:15 p.m., he saw a line of people coming out from where the performers were coming onstage.
"All the sudden I heard someone saying that there was a shot, that someone got shot," Rodriguez said, the Associated Press reported.
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 T.I was not onstage when the shots were fired.
Video shot inside the venue showed a chaotic scene as concertgoers rushed to the sides trying to leave the area as a group of people tended to a person on the floor.
No arrests were made.
No other information was immediately available.