I can't find anything in the reports that says that someone witnessed this event. I find it very suspect that a police officer would have a bullet in the chamber AND the safety off.

Additionally it says the shot punctured a lung and went through the heart. If the gun was holstered it doesn't that seem like the bullet would have traveled downward into abdominal area.

~If~ this was a murder, it is not out of the question to embrace the victim and fire the shot from the holster through one's clothing?

Amateur forensics, I know, but there are too many question marks that make this tragedy smell more than accident.