2 Suspects in Custody, 3rd Sought in Murder of Witness in Amber Guyger Trial

Dallas Assistant Chief of Police Avery Moore addresses the media about a drug deal gone bad resulting in the death of Joshua Brown. The police are still looking for suspects Thaddeous Charles Green and Michael Diaz Mitchell. Yhey already have Mitchell's nephew, Jacquerious Mitchell, in custody. Brown, who was a neighbor of Botham Jean at the South Side Flats, was also a character witness in the Amber Guyger trial. The press conference was held at Dallas Police Headquarters in Dallas, Tuesday, October 8, 2019. Tom Fox/The Dallas Morning News

DALLAS—After days of feverish speculation, authorities said the killing of a witness who testified at the recent murder trial of a former Dallas police officer had nothing to do with the closely watched case and instead resulted from a drug deal gone bad.

Authorities searched Wednesday for a third Louisiana man who is a suspect in last Friday’s killing of Joshua Brown. Brown was killed just two days after a jury sentenced former officer Amber Guyger to 10 years in prison for killing her upstairs neighbor Botham Jean.