When dealing with the police, it would be stupid to not have a lawyer. I also don’t know if he is actually being represented by a lawyer because he is guilty of anything, as opposed to having a lawyer merely speaking for him. Third, it is possible that he needs a lawyer for something entirely separate than the shooting itself.
Tiffany Mitchell had her lawyer with her when she was telling her story to CNN. The lawyer said he was also representing her friend who was standing on her balcony at the nearby apartments and also saw some of what happened.
My guess is they’re going to try and claim some kind of mental distress/anguish from having witnessed the ‘execution’ of brother Brown.