correct. reporter: an investigation is underinto the shooting death of underway into the shooting death of robinson. the union chief saying it will take a minimum of four to six months to complete. gary tuchman, cnn, madison, wisconsin. the way the police chief there some n there is handling this is very different from what happened in ferguson, missouri. they re coming out in front of the situation and releasing the officer s name involved. they don t want to see a repeat in any way, shape, or form. the protests have remained peaceful. the mayor says robinson s past won t have any bearing on the investigation, and they will get answers. listen to this. we are not going to put tony on trial. that s not what this is about. what this is about is finding out exactly what happened that night and to determine responsibility. we know that he was not armed. as far as the police chief and