UPDATE (11:03 a.m.): OKLAHOMA CITY (AP) — Police say the man accused of fatally shooting an Oklahoma City airport employee used to work for Southwest Airlines and that the attack was likely in retaliation for circumstances that led to the attacker’s 2015 resignation.

Capt. Paco Balderrama identified the shooter as Lloyd Dean Buie, of Oklahoma City.

He says Buie resigned from Southwest Airlines in April 2015 and that investigators believe he shot and killed 52-year-old Michael Winchester on Tuesday in retaliation for circumstances that led to Buie leaving the job.

Balderrama says he doesn’t know what Buie did for Southwest or why he resigned. He says Winchester was not Buie’s immediate supervisor.

Buie was found dead of a self-inflicted gunshot wound shortly after Tuesday afternoon’s shooting.

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OKLAHOMA CITY (AP) — The father of Chiefs long snapper James Winchester was shot and killed Tuesday in what police are calling a premeditated attack at Oklahoma City’s Will Rogers World Airport.

Michael Winchester was shot while walking between a terminal and the airport employee parking area. The 52-year-old Winchester was a Southwest Airlines employee and a former University of Oklahoma football player.

The unidentified suspect was later found dead in a pickup truck at a public parking garage overlooking the scene.

Airport spokeswoman Karen Carney says air traffic control implemented a ground stop after the shooting. The ground stop was lifted at about 6 p.m. Tuesday and flight operations resumed, though 25 flights were canceled because of the incident.

Fifteen of the canceled flights were operated by Southwest Airlines. The company’s CEO, Gary Kelly, said on Twitter that the airline “will do everything we can to support Mike’s family.”