Williams said he used at least one handgun in the attack. "Traumatized and devastated", the gamer added.
Katz, a Baltimore native., went by the alias "Bread".
With Florida voters scheduled to select candidates for governor and Congress on Tuesday, some Democratic contenders said the shooting on Sunday in Jacksonville was further evidence of the need for stricter gun legislation while other hopefuls canceled campaign appearances. "He's a man of business", the announcer said.
The event at a Chicago Pizza in Jacksonville Landing was a regional qualifier for a final to be played in Las Vegas, with a prize pot of £129,000.
The gunman, Katz, was a professional gamer himself.
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Mass Shooting At Florida Madden 19 Video Gaming Tournament-Multiple Fatalities
Police found Katz's vehicle near the scene of the shooting , and believed he had been staying at a nearby hotel. Releasing information about the second suspect, authorities said , "Single suspect is a white male".
A tweet by National Football League team Buffalo Bills two years ago shows a picture of a man named David Katz holding up a t-shirt that says "Madden champ", with the caption: "Congrats to David Katz, the Madden 17 Bills Championship victor!" "I think personally I'm one of the better players", he said.
"As bad as this is, it could have been much worse", said Williams.
Katz had also been competing at the tournament and had been eliminated earlier. Apparent gunshots can be heard in recordings from the tournament on the bar's Twitch account, which was streaming the competition.
The event was a qualifying tournament for the Madden Classic, our first Madden EA Major competition of this season. One person was taken to Baptist Medical Center with a minor injury.
"Their deaths are an inconceivable tragedy, and we offer our deepest sympathies to their families, to those injuries and everyone affected by this", the statement from EA read.
Taylor Robertson was a husband and father, who won the National Football League game tournament previous year. "We will work with our partners and our internal teams to establish a consistent level of security at all of our competitive gaming events".