"He loved football, and out of all the videogames he could play, he settled on and mastered 'Madden,'" Pettijohn said. "He made a good living gaming, and he saved his earnings so he could afford to go to college to continue his education."
Robertson, who used the gamer tag "Spotmeplzzz," won the Madden Classic tournament in 2016. In a YouTube interview published by EA Sports, Robertson said he had played Madden NFL since he was 10 and started playing competitively a few years ago.
"It's certainly possible for any player to do this," Robertson said in the video. "You've just got to put in the time. You've got to grind. You've got to play a lot of games and just working on getting better."
Fellow gamers described Robertson as a family man dedicated to his wife and children.
Gamer Derek Jones, who lost to Robertson in the 2016 tournament, said his onetime rival was "one of the nicest people I ever met."
"There's no way that guy did anything to deserve to get shot," said Jones, who traveled to the Florida tournament from Santa Fe, New Mexico. "He's got a family at home, and he just came out here to try to win some money for this family."
Gamer Shay Kivlen of Seattle said he met Clayton, whose gamer tag was Trueboy, about five years ago. They bonded because both of them played games on a PlayStation 4 — which put them at odds with many gamers who prefer Microsoft's Xbox.
The two friends would chat daily online and see each other about six times a year at gaming tournaments. About a week before the Florida shootings, Kivlen said, he was visiting San Diego and Clayton drove 2 ½ hours in rush hour traffic to meet him.