The gamer who killed two people at a Madden video tournament appeared to have been targeting high-profile players, one of his competitors told The Post on Monday.

“I do believe he was targeting big names in the community,” said East Orange, NJ., resident Dennis Alston, 27. “People who were high-level gamers … Everyone that was shot was someone that was known.”

Alleged Killer David Katz had played four games during the Southeast Qualifiers in Jacksonville, Fla., for the Madden Classic 19 over the weekend before launching his rampage, authorities said. He won two games and lost two – one to Alston on Saturday and one to Alston’s pal Sunday. None of the people he allegedly shot played against him that weekend.

“If he specifically wanted to kill the people he lost to, he had the opportunity to do that,” Alston said.

The slain gamers, rising star Elijah Clayton, 21, and past championship winner Taylor Robertson, 27, were well-known and well-liked members of the community.

Katz, 24, of Baltimore, also wounded 11 others at the GLHF Game Bar on Sunday before turning the weapon on himself, authorities said.