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Memphis, Tenn. • An ex-con accused of fatally shooting a police officer who interrupted a drug deal turned himself in Monday, ending a two-day manhunt, authorities said.

Tremaine Wilbourn, 29, is accused of killing Officer Sean Bolton on Saturday night after the officer approached a car along a street that had been known for years as a quiet oasis amid a troubled neighborhood.

Wilbourn was with his family and an attorney when he turned himself in.

"I think he felt the walls closing in and thought it would be in his best interest to turn himself in," Memphis Police Director Toney Armstrong said Monday.

Armstrong spoke briefly to Wilbourn and the suspect told him: "I want you to know that one, I'm not a cold-blooded killer and two, I am not a coward."

Armstrong had used that word to describe Wilbourn amid the manhunt.

On Saturday night, police said Wilbourn was a passenger in a 2002 Mercedes Benz that was parked illegally in the southeastern Memphis neighborhood. Bolton approached the car, Wilbourn got out of the Mercedes and the two men got into a struggle, police said. Wilbourn took out a gun and fired, striking Bolton multiple times. Then Wilbourn and the driver ran away as a civilian used Bolton's radio to notify police, authorities said.

The driver later turned himself in and was released without charge. Wilbourn's first court appearance is expected Tuesday.

Officers said they found about 1.7 grams of marijuana in the car.

Wilbourn was on probation for armed bank robbery. A sentencing memorandum filed by Wilbourn's lawyer on May 16, 2006, said Wilbourn was persuaded by his uncle to join the robbery to help him with his finances and "he was awaiting news regarding a possible college scholarship based on his athletic ability."

He was sentenced to more than 10 years in federal prison and released on probation in July 2014. The documents said witnesses to the officer's shooting identified Wilbourn in a photo lineup.

Wilbourn, who goes by the names Tremaine Martin and "T-Streetz," is black. Bolton, who was white, was a 33-year-old Marine who served in Iraq.

He was the third Memphis officer to be fatally shot in slightly more than four years. His funeral was scheduled for Thursday.