Key witness in ex-Dallas officer Amber Guyger’s murder trial shot and killed

John Bacon, USA TODAY

Dallas police are investigating the fatal shooting of a man who testified in the murder trial of a former police officer convicted last week of killing a neighbor after confusing his apartment with her own.

Joshua Brown lived near Botham Jean, who was killed in September 2018 by then-officer Amber Guyger after she mistook him for an intruder. Brown testified that he heard Guyger and Jean's voices in the moments before the fatal shots rang out, but did not hear Guyger issue any warning commands.

Brown himself became a murder victim days later. Police said several witnesses flagged officers down Friday night, directing them to the parking lot where Brown was lying on the ground with multiple gunshot wounds. He was rushed to a hospital where he was pronounced dead.

"I just spoke with Joshua Brown's mother. She is devastated. We all are," S. Lee Merritt, a lawyer for Jean's family, said on Twitter. "Joshua Brown was key witness in the murder of Botham Jean that helped put Amber Guyger away. We need answers."

No arrests had been made and police have not discussed possible motives for the shooting. Police were looking for a silver, four-door sedan seen speeding from the scene.

"Figuring out what happened to Joshua Brown will take something we just haven’t mastered yet: Unity," Merritt tweeted Sunday.

In this Tuesday, Sept. 24, 2019, photo, victim Botham Jean's neighbor Joshua Brown, left, answers questions from Assistant District Attorney LaQuita Long, right, while testifying during the murder trial of former Dallas Police Officer Amber Guyger, in Dallas. Authorities say that Brown was killed in a shooting Friday, Oct. 4.

Guyger was fired from the force days after shooting Jean. Last week she was convicted of murder and sentenced to 10 years in prison. In an emotional moment shortly after the sentencing, Jean's brother, Brandt Jean, said that he had forgiven Guyger and hugged her in the courtroom.

Merritt said in a weekend Instagram post that Brown's murder "underscores the reality of the black experience" in America. Brown deserves the same justice sought for the Jean family, Merritt said.

'I want the best for you': Botham Jean's brother hugs Amber Guyger

Merritt challenged the Dallas County criminal justice system to "mobilize" to identify Brown's killer and and ensure the shooter is held accountable.

"Brown lived in constant fear that he could be the next victim of gun violence, either state sanctioned or otherwise," Merritt said. "We have more work to do deal with the constant threats to our community both from within and without."

This article originally appeared on USA TODAY: Amber Guyger trial: Witness in ex-Dallas officer’s murder trial killed