roberson, an armed bouncer at a bar, had pinned down a shooting suspect until officers arrived. that s when one of them opened fire, killing roberson. police officer just saw a black man. i believe if he was indeed white he would be alive. reporter: tonight, that officer is on administrative leave. roberson, a musician at local churches, was a new dad. he hoped to one day be a police officer. and david, while the incident is still under investigation, the police department says they are devastated, calling roberson a great man who was doing his best to stop an active shooter. david? erielle reshef tonight. erielle, thank you. and from brooklyn tonight, the trial of a notorious mexican drug lord joaquin el chapo guzman, began amid extraordinary security today. he faces charges for murder, torture and drug trafficking here in the u.s. security is so high, partly because of his history of prison escapes. marshals are escorting jurors to and from the court and two of those jurors