It was the lead detective in the dead guy's criminal case. And how much crap will he have to endure? None or very little. Because it was a shooting, he'll have to ride a desk for a while, but he's got the statements of the Judge, the prosecutor, other court personnel, the jury, people in the courtroom, and a host of others.
I don't know about Milwaukee courtrooms, but the ones we have here in Brown County, Wisconsin, have security cameras in them with tape machines busily running. If Milwaukee county had security cameras in the courtrooms, they should have a tape of today's events.
The DA is going to review the case (that's mandatory), and within a day or two issue a ruling: Justifiable Homicide. You can put your money on it.