A key witness in Amber Guyger's murder trial was shot and killed Friday evening at an apartment complex near Dallas' Medical District, authorities said.

Joshua Brown, a neighbor of Botham Jean and Guyger at the South Side Flats apartments, was slain about 10:30 p.m. in the 4600 block of Cedar Springs Road.

Joshua Brown was a key witness in the conviction of Amber Guyger, but was recently shot and killed uinder suspicious circumstances. Police believe it was a drug deal gone bad, but many people are skeptical about this conclusion. Many think Brown was killed as part of a racist revenge tactic by a hate group trying to avenge Amber Guyger conviction (But that is just speculation). The investigation is on-going.