The Mitchells are related, but Moore did not make any additional comments on that.
Michael Mitchell is suspected of being the getaway driver. Detectives remained in Louisiana on Tuesday searching for the suspects.
Authorities confiscated 5.4 kilograms of marijuana, 149 grams of THC cartridges and more than $4,000 in cash during a search of Brown's home. Two months after Jean's death, Brown was shot outside a Dallas nightclub and felt that the shooter would return, Merritt shared in a social media post.
The conversation between Green and Brown turned into a physical altercation, Moore said, at which time Mitchell got out of the vehicle. While Green and Brown were talking, things got physical, resulting in Brown shooting Jacquerious Mitchell and Green shooting Brown.
Jacquerious Mitchell, 20, is in custody, Assistant Chief of Police Avery Moore said at a news conference Tuesday.
Police identified the men as Thaddeous Green, Jacquerious Mitchell and Michael Diaz Mitchell.
The conspiracy theories surrounding his death underscored the distrust that some Dallas residents have for their police department.
Green allegedly took Brown's gun and backpack and fled. 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. "Warrants will be executed for him and the other two suspects for Capital murder".
"I want to thank everyone who demonstrated patience and responsibly reserved their judgment while the Dallas Police Department gathered the facts regarding the death of Joshua Brown".
"I assure you that is simply not true", Moore said. "Brown's death was related to the Amber Guyger trial, and somehow the Dallas Police Department is responsible", he said.
"We value human life here", Moore said. The former officer was found guilty of murder and sentenced to 10 years in prison last week. He was a key witness in Guyger's trial. He testified he didn't hear any police commands like "Show me your hands", before hearing the gunshots.
He was transported to a local hospital, where he died from his injuries, according to police.
Lee Merritt, who was an attorney for Jean's family and for Brown's family called his death "suspicious".
In his testimony, Brown, 28, who had met Jean on the same day he was murdered, mentioned that he always heard Jean singing. Immediately after, he said, gunshots rang out. Prosecutors managed to recover the texts and argued that Guyger was distracted by the explicit messages she exchanged with Rivera soon before she walked into Jean's apartment, which she said she thought was her own.
Amber Guyger, to ten years in prison for killing her black upstairs neighbor in a case that sparked fierce debate over race, politics and policing.