O'Hare International Airport

Police search for motive in killing of airport worker

Oklahoma City police investigators worked to piece together why a man waited to gun down an airline employee outside Will Rogers World Airport on Tuesday in an ambush that forced hundreds of travelers to take shelter and prompted authorities to shut down the state's busiest airport for hours.

Police later discovered the suspected shooter dead from an apparently self-inflicted gunshot wound inside a pickup truck in a parking garage near where they believe he waited, watching airport employees come and go before shooting and killing Michael Winchester, 52, a Southwest Airlines employee.

"We do believe this was a premeditated act against the victim," said Oklahoma...