OKLAHOMA CITY -- A man who gunned down a Southwest Airlines employee outside of Oklahoma Citys airport likely did so in retaliation for having lost his own job with the airline last year, police said Wednesday.Lloyd Dean Buie, 45, killed 52-year-old Michael Winchester on Tuesday as Winchester was leaving work and walking to an employee parking lot, police Capt. Paco Balderrama said at a news conference. Buie fired the shot from the fourth floor of a parking garage when Winchester was about 50 yards away, he said. Buie was later found dead in his pickup truck in the garage.We know his intention was to go to the airport to hurt someone, Balderrama said. The suspect knew where the employees parked and where they would be walking.Winchester died from a single gunshot wound to the chest, the Oklahoma Medical Examiners Office ruled Wednesday. Buies death was ruled a suicide from a single gunshot wound to the head.Buie quit his job as a ramp agent for Southwest in April 2015 after he refused to take an alcohol screening, airline spokeswoman Brandy King said Wednesday. She said co-workers had suspected Buie was under the influence at work, but she declined to say if Winchester, a ramp supervisor who had worked for Southwest for 29 years, was involved.Our Southwest family is grieving, as we are deeply saddened by the loss of our family member. Our focus remains on offering support to the Winchester family and Southwest employees during this difficult time, King said.Police said Winchester wasnt Buies immediate supervisor, but they believe the circumstances surrounding Buies quitting were likely his motive for the attack.The Associated Press tried calling four of Buies family members, but the calls either rang unanswered or the numbers had been disconnected.Winchester, who has a listed address in Washington, a community about 35 miles south of the airport, was a former University of Oklahoma football player whose son James is a long snapper for the Kansas City Chiefs.Chiefs players and coaches expressed support for their teammate Wednesday, with head coach Andy Reid saying James Winchester had returned to Oklahoma to be with his family and that he didnt know if hed return in time for Sundays game against Tampa Bay. Punter Dustin Colquitt said he spoke to Winchester, who told him: Obviously this is a tough time for my family, but I appreciate the thoughts and prayers.The shooting set off a scramble at Will Rogers World Airport, with police immediately closing the sprawling complex and asking passengers to seek cover.Police found Buies pickup truck in the parking garage about three hours after the shooting. They used a robot to determine he was dead inside it before giving the all-clear.Balderrama said Buie likely would have needed a scope on his rifle to shoot Winchester from that distance.It would definitely require familiarity with a rifle, he said. You dont have to be an expert marksman to hit a 50-yard shot, but its not an easy shot either.The attack led to the cancellation of 25 flights. 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The Frenchman followed up the sixth-place finish he managed Australia by going one better in Bahrain and heads to Shanghai for the third race of the season brimming with confidence.It has been an stunning start to life for Haas, who currently sit fifth in the Constructors Championship in their debut season, ahead of more established teams such as Force India, Toro Rosso and McLaren. Herbert expects more of the same this weekend, with the former Lotus driver, a 13/8 shot for another top-six finish, already having an impressive record at the Shanghai circuit.He said: Haas have started their F1 life in incredible fashion with Grosjean taking back-to-back top-six finishes. With others faltering I can see the Frenchman hitting the field for six and coming home to score another brilliant points haul on a track where hes scored points in three of his previous four starts. Herberts Tips Johnnys backing Kevin Magnussen to finish in the points in China at odds of 8/1 with Sky Bet Herbert is also backing Renaults Kevin Magnussen to secure a points finish at odds of 8/1 with Sky Bet.dddddddddddd.The Sky Sports pundit added: Renault have finished 11th in the first two races and have shown an improvement in their engine. Now, it may struggle a little on the long back straight in Shanghai, but theres no reason why they cant squeeze into the top 10 and Magnussen is a terrific price to do just that.After eight successive victories, including five on the bounce for Nico Rosberg, Herbert expects Mercedes to continue their domination in China and secure their 100th podium. A double podium finish is an odds-on shot with the online bookmaker.He added: Rather than choose between Rosberg or Hamilton, Id rather congratulate them for a third 1-2 finish in a row in Shanghai and back both drivers for a podium spot.Johnny Herberts Charity tips this season are supporting Sporting Memories. Also See: F1 gossip column Every 2016 race live ' ' '