Three suspects have been identified in the murder of Joshua Brown, a key witness in the murder trial of former Dallas police officer Amber Guyger.

Jacquerious Mitchell, 20; Michael Mitchell, 32; and Thaddeous Green, 22, traveled from Alexandria, Louisiana to purchase drugs from Brown, authorities said at a news conference Tuesday. Jacquerious Mitchell is in custody and the other two are on the loose, Dallas Police Department Assistant Chief of Police Avery Moore said at a news conference Tuesday.

Thaddeous Charles Green is accused of shooting Brown two times, Moore said. On the night of the shooting, Green had a conversation with Brown that escalated into an argument.

15 PHOTOSFormer Dallas officer Amber Guyger convicted of killing her neighbor, Botham JeanSee GalleryFormer Dallas officer Amber Guyger convicted of killing her neighbor, Botham JeanFILE – This file photo provided by the Kaufman County Sheriff’s Office shows Amber Guyger. A grand jury began hearing evidence Monday, Nov. 26, 2018, in the case of Guyger, a former Dallas police officer who fatally shot her unarmed black neighbor in his own apartment after she said she mistook it for hers on Sept. 6, 2018. (Kaufman County (Texas) Sheriff’s Office via AP, File)This March 24, 2014, photo provided by Harding University in Searcy, Ark., shows Botham Jean, speaking at the university. Authorities said Friday, Sept. 7, 2018, that a Dallas police officer returning home from work shot and killed Jean, a neighbor after she said she mistook his apartment for her own. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (Jeff Montgmery/Harding University via AP)South Side Flats is shown in this Friday, Sept. 7, 2018 photo. A Dallas police officer returning home from work shot and killed a neighbor after she said she mistook his apartment for her own, authorities said Friday. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (Vernon Bryant/The Dallas Morning News via AP)South Side Flats is shown in this Friday, Sept. 7, 2018 photo. A Dallas police officer returning home from work shot and killed a neighbor after she said she mistook his apartment for her own, authorities said Friday. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (AP Photo/Ryan Tarinelli)This photo from video released Thursday, Sept. 13, 2018, by the Kaufman County Sheriff’s Office in Kaufman, Texas, shows Dallas police Officer Amber Guyger getting booked after turning herself in Sunday, Sept. 9 following the fatal shooting of Botham Jean in his own apartment. Guyger was arrested manslaughter and has since been released on bond. (Kaufman County Sheriff’s Office Jail via AP)South Side Flats apartments are shown in this Monday, Sept. 10 2018 photo in Dallas. Authorities say a Dallas police officer said she shot a neighbor whose home she mistakenly entered last week after he ignored her “verbal commands.” David Armstrong of the Texas Rangers wrote in an arrest affidavit released Monday that Officer Amber Guyger said she didn’t realize she was in the wrong apartment until after she shot 26-year-old Botham Jean and went into the hallway to check the address. Guyger was booked Sunday on a manslaughter charge in Thursday night’s killing of Jean and was released on bond.(AP Photo/Ryan Tarinelli)Brandt Jean, center left, brother of shooting victim Botham Jean, hugs his sister Allisa Charles-Findley, during a news conference outside the Frank Crowley Courts Building on Monday, Sept. 10, 2018, in Dallas, about the shooting of Botham Jean by Dallas police officer Amber Guyger on Thursday. He was joined by his mother, Allison Jean, left, and attorney Benjamin Crump, right. (AP Photo/Ryan Tarinelli)South Side Flats is shown in this Friday, Sept. 7, 2018 photo. A Dallas police officer returning home from work shot and killed a neighbor after she said she mistook his apartment for her own, authorities said Friday. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (Vernon Bryant/The Dallas Morning News via AP)A resident holds up an electronic key used to open an apartment door at the South Side Flats in this Monday, Sept. 10 2018 photo in Dallas. Authorities say a Dallas police officer said she shot a neighbor whose home she mistakenly entered last week after he ignored her “verbal commands.” David Armstrong of the Texas Rangers wrote in an arrest affidavit released Monday that Officer Amber Guyger said she didn’t realize she was in the wrong apartment until after she shot 26-year-old Botham Jean and went into the hallway to check the address. Guyger was booked Sunday on a manslaughter charge in Thursday night’s killing of Jean and was released on bond.(AP Photo/Ryan Tarinelli)South Side Flats is shown in this Friday, Sept. 7, 2018 photo. A Dallas police officer returning home from work shot and killed a neighbor after she said she mistook his apartment for her own, authorities said Friday. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (AP Photo/Ryan Tarinelli)People stand near Botham Jean’s apartment in this Monday, Sept. 10 2018 photo in Dallas. Authorities say a Dallas police officer said she shot a neighbor whose home she mistakenly entered last week after he ignored her “verbal commands.” David Armstrong of the Texas Rangers wrote in an arrest affidavit released Monday that Officer Amber Guyger said she didn’t realize she was in the wrong apartment until after she shot 26-year-old Jean and went into the hallway to check the address. Guyger was booked Sunday on a manslaughter charge in Thursday night’s killing of Jean and was released on bond.(AP Photo/Ryan Tarinelli)South Side Flats is shown in this Friday, Sept. 7, 2018 photo. A Dallas police officer returning home from work shot and killed a neighbor after she said she mistook his apartment for her own, authorities said Friday. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (Vernon Bryant/The Dallas Morning News via AP)This photo from video released Thursday, Sept. 13, 2018, by the Kaufman County Sheriff’s Office in Kaufman, Texas, shows Dallas police Officer Amber Guyger getting booked after turning herself in Sunday, Sept. 9 following the fatal shooting of Botham Jean in his own apartment. Guyger was arrested manslaughter and has since been released on bond. (Kaufman County Sheriff’s Office Jail via AP)A Dallas Police vehicle is parked near the South Side Flats apartments on Monday, Sept. 10 2018 photo in Dallas. Authorities say a Dallas police officer said she shot a neighbor whose home she mistakenly entered last week after he ignored her “verbal commands.” David Armstrong of the Texas Rangers wrote in an arrest affidavit released Monday that Officer Amber Guyger said she didn’t realize she was in the wrong apartment until after she shot 26-year-old Botham Jean and went into the hallway to check the address. Guyger was booked Sunday on a manslaughter charge in Thursday night’s killing of Jean and was released on bond.(AP Photo/Ryan Tarinelli)South Side Flats is shown in this Friday, Sept. 7, 2018 photo. A Dallas police officer returning home from work shot and killed a neighbor after she said she mistook his apartment for her own, authorities said Friday. The officer called dispatch to report that she had shot the man Thursday night, police said. She told responding officers that she believed the victim’s apartment was her own when she entered it. (Vernon Bryant/The Dallas Morning News via AP)Up Next

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Brown, 28, was found lying on the ground in an apartment parking lot with multiple gunshot wounds, two days after Guyger was convicted of murder.

Brown’s slaying occurred less than six miles from the apartment complex where Jean was fatally shot by Guyger on Sept. 6, 2018. Brown, who was killed Friday, testified in Guyger’s murder trial about the September 2018 night that she fatally shot Botham Jean, who was his neighbor.

Brown had lived across the hall from Jean, 26, at the Southside Flats apartment building in Dallas.

Guyger, who lived a floor below Jean, testified she mistakenly entered his apartment instead of her own.

She was sentenced to 10 years in prison.

This is a developing story. Check back for updates.

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