Botham Jean's former neighbor shot to death

Joshua Brown, 28, a key witness in the trial of Amber Guyger, was killed at a Dallas apartment building just days after Guyger was convicted of killing Jean.
2:09 | 10/07/19

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Transcript for Botham Jean's former neighbor shot to death
We're now moving on to the manhunt under way for the person who gunned down a witness in the amber guyger trial. Joshua brown mysteriously killed just days after guyger was convicted and his emotional testimony about the night botham Jean died. Linsey Davis has the latest. Please state your name for the record. Joshua brown. Reporter: He was a key witness for the prosecution in the trial of amber guyger and now Joshua brown is dead. The 2-year-old gunned down on Friday shot to death just ten days after his testimony. The only thing we heard was one shot. Reporter: Brown had previously lived across the hall from botham Jean who was the name age. He broke down on the witness stand testifying he had met his neighbor for the first time on the day he was killed. I heard him singing in the morning. You heard him singing. What kind of things did you hear him sing? Gospel music, drake. Reporter: After guyger says she mistakenly entered Jean's apartment, brown testified that he heard the pair interacting but never heard the officer give him any instructions contradicting her testimony. Do you recall ever hearing someone say, hey, put your hands up in a loud tone? No, no, ma'am. Reporter: Dallas police tell us that brown, an entrepreneur, was discovered Friday night lying on the ground of a parking lot at his current residence with multiple gunshot wounds to his lower body. His family lawyer who also represents botham Jean's family called him a reluctant witness which now raises new questions about just why he was killed. He was shot and left to die by someone who clearly had an ax to grind. Reporter: Police say multiple witnesses heard several gunshots and saw a silver four-door sedan speeding out of the parking lot and currently do not have a motive or any suspects. There is now a $100,000 reward leading to brown's killer. You know, we heard from brown -- the family attorney and he's saying he believes there is a connection between his testimony and his death. Police, though, remaining really tight-lipped. The lawyer said there were implication, there's not evidence to that but there are A lot of speculation. That's his belief. So chilling. Thanks. Overseas to a controversy

This transcript has been automatically generated and may not be 100% accurate.

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