Omar Mateen, who authorities say killed 49 people at the gay nightclub Pulse in Orlando, Fla., was reportedly no stranger to the club.
Multiple media outlets are reporting that some Pulse regulars recognized Mateen, saying that he spent time at the nightclub before the shooting early Sunday.
Meanwhile, at least two men say they interacted with Mateen on gay dating apps.
NPR.org: http://www.npr.org/sections/thetwo-way/2016/06/14/481986819/reports-gunman-had-visited-nightclub-before-used-gay-dating-apps
