Suspicious Circumstances or "Puzzling Evidence"
On top of all the suspicious circumstances surrounding this incident (lack of information, questionable employment history of the LEO involved, lack of evidence of probable cause for a felony warranting this type of high-risk behavior from law enforcement), one thing sticks out in my mind. Only a single shot was fired.
Every small arms and personal defense course I've ever taken teaches the use of double taps. My understanding of SOP for the CSP, if I'm wrong please correct me here, is to aim for the center of mass and fire using double taps. The fact that only a single shot was fired leads me to believe that the officer already had the firearm drawn and was very sloppy in his handling of said firearm (finger on the trigger, safety off (if the side-arm he was carrying has an external safety), without having formulated the decision to fire). Due to the lack of information on this case, this is pure conjecture, but it just seems a little bit suspicious to me that only a single shot was fired and according to witnesses that shot was fired immediately upon the door opening. It sounds to me like the shot was fired as a result of stress and a lack of training.
If there is proof that there was a good reason for his behavior, I hope that the officer gets exonerated with minimal negative impact on his life. On the other hand, if there is not strong evidence of probable cause for his behavior, I hope that he is prosecuted to the fullest extent of the law in the same way that any of us "civies"would be and that this isn't just swept under the rug (with him simply losing his job) like so many other LEO involved shootings have been in recent years across this country.