 Law enforcement boats patrol the St. Johns River at the scene of a multiple shooting at the Jacksonville Landing Sunday, Aug. 26, 2018 in Jacksonville, Fla. A gunman opened fire Sunday during an online... (Associated Press) 
 
 Law enforcement boats patrol the St. Johns River at the scene of a multiple shooting at the Jacksonville Landing Sunday, Aug. 26, 2018 in Jacksonville, Fla. A gunman opened fire Sunday during an online video game tournament that was being livestreamed from a Florida mall, killing multiple people and... (Associated Press) 
 
 JACKSONVILLE, Fla. (AP) — The Latest on a deadly mass shooting at a video game tournament in Jacksonville, Florida (all times local): 
 
 10:15 a.m. 
 
 A gaming rival of the former gaming champion suspected of killing two competitors, wounding nine others and killing himself recalled him as "being kind of different." “We believe the suspect to be 24-year-old David Katz of Baltimore, Maryland.” 
 
 Katz is believed to have opened fire during a “Madden 19” qualifying tournament at a Chicago Pizza around 1:30 p.m. » People in the online gaming community said Katz had played under the game tag “RavensChamp” and “Bread.” 
 
 » Jacksonville Sheriff Mike Williams said Monday that Katz legally purchased the two handguns he used in the shooting from a licensed dealer in the Baltimore area.
– Police have identified the shooter at a gaming tournament in Jacksonville, Florida, Sunday as 24-year-old David Katz of Baltimore. What they don't know is what prompted Katz to open fire in the "Madden 19" qualifying tournament, fatally shooting two fellow competitors and wounding nine others before killing himself. But perhaps this is part of it: The Los Angeles Times and and Jacksonville.com both report that Katz had been knocked out of the tournament before his shooting spree. Related coverage: Intense: One thing that has emerged about Katz is that he was seen as an intense competitor. The Baltimore Sun notes that an announcer introducing Katz at the Jacksonville tournament said this of him: “David Katz keeps to himself. He’s a man of business. … He’s not here to make friends.” Competitor Shane Kivlen tells the AP that "something was off about him." Former champ: This video shows Katz, playing as "Bread," winning a 2017 tournament, along with a subsequent interview. The Washington Post writes that his "thin face is clenched in a serious look" during competition, and his "face is again drained of emotion" during the interview, "his eyes roaming the floor as he answers questions." The Buffalo Bills congratulated Katz after the 2017 win with this tweet.