Updated below…..

Gamer turned killer David Katz, 24 – photo: Drudge Report

Sunday afternoon, police responded to a ‘mass shooting’ at Jacksonville Landing in Florida which left 3 dead and 11 wounded.

According to witnesses, the killer, David Katz, began shooting shortly after he lost the Madden NFL gaming tournament.

Footage and audio of the shooting the moment it happened during a livestream at the Madden NFL tournament was captured.

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A red laser dot appeared on the player wearing the red sweatshirt the moment the shooting started (video below).

Breaking: Reports of a shooting at the Jacksonville Landing during a Madden video game tournament in Jacksonville, Florida. Audio reveals sounds of gunfire during the tournament. pic.twitter.com/HOrW2yj24Q — PM Breaking News (@PMBreakingNews) August 26, 2018

Jacksonville police confirmed three deceased individuals were located at the scene at Jacksonville Landing on Sunday evening.

Katz reportedly had a strange playing style and had spent time in psychiatric hospitals.

USA Today reported:

Gamers at the tournament said Katz was rather quiet. Shane Kivlen, a friend of one of the people killed, said Katz didn’t talk much with fellow gamers, either online or when they met face-to-face for Madden tournaments. He said much of what he and others knew of Katz, they learned from his baffling style of playing the game. “(Katz) would do kind of weird stuff online that other people wouldn’t do,” Kivien said. “He would catch a ball and just start jumping out of bounds and stuff when he could have gotten more yards, just hurting himself. I don’t know what he was doing.” Kivlen said Katz was smart, “but something was off about him.” The game’s maker, EA Sports, lists a David Katz as a 2017 championship winner.

UPDATE: An anonymous Reddit user was mis-identified in an earlier post.