Well, at least this shooter didn’t have his house wired with an audio/video surveillance system similar to the one used by that retired State Department security officer in MN.
http://www.myfoxtwincities.com/story/20305887/little-falls-shootings-recorded-on-surveillance-video
Seems like the homeowner should have kept his big mouth shut. If he wasn’t read his Miranda rights prior to him making them, they may not be admissible in trial.