Ty Smith told The Orlando Sentinel that he had seen 29-year-old Omar Mateen at the gay bar, Pulse.
MORE: Victims of the Pulse Nightclub shooting in Orlando
Smith said Mateen would sit and drink by himself, getting loud and belligerent.
Smith said he did not talk to Mateen much, but that Mateen mentioned having a wife and child.
MORE: Orlando mourns shooting victims; gunman may have been 'homegrown extremist'
Authorities say Mateen's rampage left 49 people dead.
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He was killed in a gun battle with police.