OKLAHOMA CITY -- A man who gunned down a Southwest Airlines employee outside of Oklahoma Citys airport likely killed the victim in retaliation for circumstances that led to the attacker leaving his 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 for the day 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.Buie resigned from Southwest Airlines in April 2015. Balderrama said Winchester wasnt Buies immediate supervisor, and though the circumstances surrounding Buies departure were not immediately available, he said investigators believe they were the reason behind the attack.Winchester, whose address is listed as Washington, Oklahoma, 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. The team tweeted Tuesday night: Our love and support is with James and the entire Winchester family.The 1 p.m. shooting set off a scramble at Will Rogers World Airport, with police immediately closing the sprawling complex and asking passengers inside to seek cover. They diverted incoming flights and refused to give already-loaded aircraft permission to leave. There were concerns the gunman might have entered the terminal and mingled among passengers or employees.Police found Buies red 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.The attack led to the cancellation of 25 flights. Normal airport operations resumed Wednesday.The airport handles between 7,000 and 8,000 passengers daily for Alaska, Delta, Southwest and United airlines and has a separate terminal that serves as a transfer center for federal inmates. A jet carrying inmates to the transfer site was allowed to land while the rest of the airport was shuttered.Michael Winchester was a punter on the University of Oklahomas 1985 national championship team.Our hearts are truly heavy for the entire Winchester Family. Mike was a former Sooner student athlete as was his son James/daughter Carolyn, the schools athletic director, Joe Castiglione, tweeted Tuesday afternoon. He added daughter Becca was also a student athlete. Please keep this beautiful family in your prayers in a later tweet.---Associated Press writers Ken A. Miller and Tim Talley contributed to this report. 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Force Indias Sergio Perez has rebuilt his reputation after being dropped by McLaren after a single season in 2013 and said Kvyat is a very strong driver, mentally as well, and he will overcome that impact for a driver.Christian Horner Q&AAsked how easy it would be for the Russian to recover, Perez replied: Its obviously very hard to do that. It was the same with me when McLaren dropped me. People suddenly stopped believing in me.People in F1 have very short memories. They wont remember his podiums or the great momentum he had at Toro Rosso, or why they chose him in the first place. They wont remember that, they will just remember that he didnt perform and they dropped him. Max Verstappen and Daniil Kvyat face the media after it was announced the pair would swap places between the Red Bull and Toro Rosso teams If he has to deliver results he will rebuild his reputation. If hes not with Red Bull, he might find another alternative in the future.Williams Felipe Massa, now one of the grids most experienced drivers, reverted to a test driver role with Ferrari for a season after his debut campaign racing for Sauber in 2002 ended with an abrupt contract termination.Kvyat shocked by Red Bull demotionThe 35-year-olld, who went on to win 11 grands prix and finish runner-up in the 2008 world championship, has urged Kvyat to keep believing in himself and follow the path of others.ddddddddddddIn Formula 1, its difficult to have a chance, so when you have one chance you need to prove yourself, Massa said.I did a good championship on my first year. I had one fifth [place], two sixths and lots of sevenths, which had no points at that time, so I did a good championship. I crashed a lot and Peter Sauber didnt like to see his car in the wall! I dont know why I lost my drive in the first year. Fernando Alonso and Lewis Hamilton react to the news of Daniil Kvyat and Max Verstappens swap, and Hamilton says the swap isnt something hed have done The second chance in F1 is even more difficult. But it can happen - like it happened for me, for Fernando [Alonso], maybe Mika Hakkinen. You need to believe.Romain Grosjeans early years in F1 proved particularly tumultuous amid a series of crashes and the now Haas driver admits I was either going back home or getting my s*** together.Its great that Red Bull has got two teams, so you can swap drivers, he added. Daniil had only one year in Formula 1 and then went straight to Red Bull [in 2015] and only four more grands prix [this year]. Its the same with Max.I think its Franz [Tost, Toro Rossos team boss] who says you need three years to be up to and ready to go to a big team. Were all different and I think its kind of easier to start in a smaller team than a big team. Watch the Spanish GP live on Sky Sports F1. 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