"For that to be taken from him over a video game - it leaves me speechless".
The gamer, who remains unidentified, said that when he beat Katz on Saturday in the group round, he attempted to shake his hand, but that Katz just stared back at him blankly.
"We didn't see like a face", Poindexter, 26, told reporters a few hours after the attack, standing on crutches after spraining her ankle trying to escape.
"Initially we thought it was a balloon popping, but there weren't any balloons in the room".
They ran to a nearby restaurant, where workers were waving people inside, and hid in a bathroom until police arrived.
Unconfirmed local reports say that Katz became angry after being knocked out of the tournament, which was a regional qualifier for the latest Madden game - Madden NFL 19, but authorities say the killer's motive is still unclear.
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Clayton was saving his winnings from competitive gaming to pay for college, Pettijohn said.
- In an interview with former Buffalo Bills player Steve Tasker, Katz talked about his skill.
Williams said he is believed to be 24-year-old David Katz, a gamer whose name had circulated online as the gunman prior to the official update from law enforcement. He says the suspect died of a self-inflicted gunshot and authorities were still confirming his identity.
A gamer, known as "DUBBY" on Twitter, said that a bullet "grazed my head".
Katz won a "Madden" championship in 2017 and his intensity was on display when he was interviewed by former National Football League star Steve Tasker, who asked about his placement as a No. 7 seed. He said one of the weapons had an aftermarket laser-sight attached.
Nine other victims were transported to area hospitals with varying degrees of injury. He added that two others were injured in the rush to flee the gunfire. The city said the two were in contact regarding the reported mass shooting.
A livestream broadcasting the "Madden NFL 19" tournament shows what appears to be a red dot flash across one of the victim's chests seconds before the first shots ring out. "Then we heard repeat shots and we took off running", said Williams, who participated in the tournament earlier.