Innocence only by reason of insanity if at all.
And when such killers are kill on scene (by their own hand or someone else) there will never be a trial, therefore no conviction and the wuss media still only refers to them as suspects. You cannot libel the dead.
I doubt his actions meet the insanity standards. But the media has always had to refer to perpetrators as "suspects" or "alleged" to protect themselves from libel lawsuits.