Eleven others were injured by gunfire, and two more injured in the rush to escape the venue, the Jacksonville Sheriff's office confirmed. At the Madden Classic Live Finals, competitors play for a share of the tournament's $165,000 prize pool, with the victor taking home $25,000, according to game developer EA Sports.
In an online stream of the Madden event posted to the website Twitch, several loud gunshots can be heard and the game abruptly stops.
Jacksonville police believe he stayed somewhere in the area Saturday night and he was at the tournament as a participant in the competition.
Survivors of February's high school shooting in Parkland, Florida, expressed sorrow at news of another mass shooting in the state. They added that one suspect was dead at the scene as they continued to search. They are searching the building now, and many people are in hiding.
William said Katz committed the shooting with a single handgun.
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Katz's vehicle was seized by police near the scene of the shooting. "Please don't come running out", the office said on Twitter.
Madden is the official video game of the National Football League.
The victims in the shooting have not yet been identified, but one of them, Drini Gjoka, 19, of DC, took to Twitter saying he was lucky that a bullet only grazed his thumb. "Traumatized and devastated", he wrote on Twitter. Police also took up positions on a bridge overlooking the river.
EA Sports, publisher of the Madden videogame, tweeted they were aware of the incident and said, "This is a awful situation, and our deepest sympathies go out to all involved". "Many blocks away", the sheriff's department said in a second tweet.
Professional gaming team compLexity had a player at the Jacksonville event.
"He was weird all weekend, I mean he had shades on, he just - he didn't speak to anybody", the man said.