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An Orange County, Fla., sheriff's deputy was shot and killed during a traffic stop in Orlando on the night of December 8, 2010, and the gunman was later found dead of a self-inflicted wound, authorities said.

Deputy First Class Brandon Lee Coates, 27, radioed in a stop on a white pickup truck near South Orange Blossom Trail and 45th Street at about 8:30 p.m., according to the Orange County Sheriff's Office. Sheriff Jerry Demings said there was nothing in that transmission to suggest the deputy was in danger.

Investigators said Coates fired his Taser during a brief struggle but was shot twice in the head before he could call for help. Within minutes, residents began calling 911 to report that a deputy was down and to describe a white truck speeding away from the scene.

Deputies found the abandoned pickup, a rented Chevrolet Silverado, less than a mile away at an apartment complex, the sheriff's office said. During the search, the body of 29-year-old Brandon Lyals was found nearby with a self-inflicted gunshot wound.

Lyals was a convicted felon who had been released from prison about a year earlier after serving roughly seven years for grand theft and burglary, according to the sheriff's office. A motive for the shooting was not established.

Coates, a U.S. Marine Corps veteran, had served with the agency about four and a half years and was assigned to its Tactical Anti-Crime Unit. He was survived by his wife, herself an Orange County deputy, his mother and his brother.

The recording released afterward runs about 27 minutes and includes both the citizen 911 calls and the deputy's own car-stop radio traffic to dispatch.