it was already played in the courtroom. >> can you please send an ambulance? please. >> reporter: a place jennifer hudson has vowed to be every day of the trial. it's entirely circumstantial meaning they will have to convince the jury he is guilty without much evidence. rob and sunny >> that's the problem. lack of forensic evidence so you don't have sort of that csi stuff that i think juries really expect after watching all of these movie, but the 911 call at least places the jury there and it's emotional. it connects. i think it connects juries to sort of the crime. >> aren't there text messages from this guy saying i'm going to kill your family if you leave me and i'm going to kill you last so you can watch them suffer? i know that's circumstantial. >> it's not enough, though. the argument that the defense will make how many types do you hear people get angry and say i'm going to kill you, i'm going to hurt you. those are idle words. this is not an easy case for the prosecution. not a slam dunk. i want to know what's going to happen, what the jury comes down with. but it's not a slam dunk. >> not a slam dunk. all right.