In Dallas, Texas, a key witness in the murder trial of former Dallas police officer Amber Guyger was shot to death outside his apartment Friday. Joshua Brown lived across the hall from Botham Jean, a black 26-year-old accountant who was shot and killed in 2018 inside his own apartment by Guyger, a white woman who was off duty at the time. During the trial, Brown gave emotional testimony about hearing gunshots the night of Jean’s murder. Officials have not yet identified a suspect in Brown’s murder. Attorney Lee Merritt, who represented the Jean family in the trial, wrote in social media that Brown’s testimony played a key role in challenging Guyger’s account of the incident and claims that she had shouted commands at Botham before shooting him. A court last week sentenced Guyger to 10 years in prison for shooting and killing Jean. She faced up to 99 years.