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story.lead_photo.caption Dallas Assistant Chief of Police Avery Moore addresses the media about a drug deal gone bad resulting in the death of Joshua Brown. The police are still looking for suspects Thaddeous Charles Green and Michael Diaz Mitchell. They already have Mitchell's nephew, Jacquerious Mitchell, in custody. Brown, who was a neighbor of Botham Jean at the South Side Flats, was also a character witness in the Amber Guyger trial. The press conference was held at Dallas Police Headquarters in Dallas, Tuesday, Oct. 8, 2019. (Tom Fox/The Dallas Morning News via AP)

DALLAS (AP) — After days of feverish speculation, authorities said the killing of a witness who testified at the recent murder trial of a Dallas police officer had nothing to do with the closely watched case and instead resulted from a drug deal gone bad.

Authorities searched Wednesday for a third Louisiana man who is suspected in last Friday's killing of Joshua Brown, which happened just two days after a jury sentenced former officer Amber Guyger to 10 years in prison for killing her upstairs neighbor Botham Jean.

Police said Tuesday that Brown was killed at a Dallas apartment complex during a drug sale gone awry, and it had nothing to do with his involvement in the Guyger case.

According to police, the three suspects are from the central Louisiana city of Alexandria and one of them, 32-year-old Michael Mitchell, was arrested by federal deputy marshals Tuesday night in the nearby community of Marksville. Mitchell's nephew, 20-year-old Jacquerious Mitchell, remained in critical condition at a Dallas hospital with a gunshot wound that police said he blamed on Brown.

The third suspect, Thaddeous Green, 22, remained at large.

Investigators believe the three were in Dallas to buy drugs from Brown, Assistant Chief Avery Moore said Tuesday. He said Jacquerious Mitchell told police Brown shot him in the chest after Green and Brown began fighting during the drug deal, and Green then shot Brown twice.

Green left with Brown's backpack and gun, police said. Authorities confiscated 12 pounds of marijuana, 149 grams of THC cartridges and more than $4,000 in cash during a search of Brown's home.

It is unclear how the three men came into contact with Brown or why they would have driven more than 300 miles to buy marijuana in another state.

The police announcement came amid widespread speculation about Brown's death, which happened two days after a jury sentenced Guyger to 10 years in prison for killing her upstairs neighbor Botham Jean in a case that added to the debate over race, politics and policing in America.

Guyger, who is white, fatally shot Jean, who was black, in September 2018 in his apartment after she returned from work. She said she mistook his fourth-floor unit for her own, which was one floor below it, and believed Jean was an intruder. She was arrested on a manslaughter charge three days after the killing, leading to criticism that the charge was too lenient, but a grand jury later decided on the more serious charge of murder.

Brown, who was black and lived on Jean's floor, was one of several neighbors who were called by prosecutors to testify at the trial.

He said that on the night Jean was killed, he heard what sounded like "two people meeting by surprise" and then two gunshots. He said he had met Jean, a 26-year-old accountant from the Caribbean island nation of St. Lucia, for the first time that day.

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