Though police have yet to identify a motive, Twitter users said Katz was upset about losing two games of Madden earlier in the tournament, refusing to shake hands with the victor after at least one game, a gamer said.
"The gamer added: "[He was here] all weekend. They remained on the scene at Katz's home in the 1200 block of Harbor Island Walk near Baltimore's Inner Harbor on Sunday night.
Police say that in addition to the three fatalities, eleven people were injured in the shooting.
Elijah Clayton, 22, and Tayor Robertson, 27, died of gunshot wounds Sunday during a shooting at a Madden 19 tournament in Jacksonville, Florida, the first of four planned qualifier events before the Madden finals in Las Vegas in October.
"We've always known he was a little off and stuff just because he wasn't social at all", gamer Shay Kivlen, 21, of Seattle, said Monday in an interview. Hes a man of business.
In another circulated video, an announcer describes Katz, who's seen in the captured livestream, as someone who "keeps to himself". While was not as established an e-sports or Madden star as Clayton, the gamer who played under the name "Spotmeplzz" won 72 percent of the Madden games he had participated in.
Pope compares Church sexual abuse, corruption to excrement, victims say
In the evening he will join 82,000 pilgrims at a musical festival in the landmark Croke Park Gaelic Athletic Association stadium. The Supreme Pontiff met privately for 90 minutes with eight survivors of abuse at the hands of the Catholic Church.
Mr Roberston who took the handle "SpotMePlzzz" was also a successful player, having won the Madden 17 Classic.
"I've been telling them for awhile, that they need to make this place safe", Jones said.
"There's so much hate in this world", White said.
Both men, who were visiting Jacksonville for the tournament, were killed when David Katz opened fire at a bar inside the Chicago Pizza restaurant in the Jacksonville Landing, a shopping center in Jacksonville. The stream then ends abruptly as gunshots are heard.
Joey Cuellar, the tournament director for the Evolution Championship Series, an esports event that focuses on fighting games, led calls for more security. "We are committed to supporting Taylor and Elijah's families through this hard time, and we send our deepest sympathies to their loved ones, to those injured yesterday, and everyone affected".
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