As others have stated, it could work for or against you. You might personally believe you did nothing wrong, but law enforcement and a prosecutor (both who often want to and will go out of their way to find any reason to lock people up) will believe otherwise. Another thing, prosecutors might use something you did or said in the 7 or so hours prior to the altercation against you as well. My only worry would be something I said or did leading up to the shoot might bite me in my backside. Maybe I had a beer at home or at a restaurant hours before. Maybe I had a personal conversation about a current event, and I mentioned that the person she have been killed. Maybe I got into an argument and said things or thinks were said about me that I wouldn't want anyone else to hear...
There are cameras on the highway, at most intersections, in the parking lots of most stores, many people have surveillance cameras on their doors, around their property, and even inside their homes. There are cameras in every store you go into, at most people's place of employment, at court, in schools, a lot of people have dash cams on their vehicles, and lastly, seemingly everyone has a cellphone nowadays who will whip it out in a heartbeat to start recording (instead of helping, calling L.E., or escaping) anything interesting. Chances are you are being recorded already and will be recorded if you are out in public when you defend yourself. IMHO, it's a no harm no foul thing if you want to wear a body camera.
Let's be realistic though, think you have better chance of hitting the lottery or being struck by lightning vs having to use your firearm in a self defense situation. IMHO many hardcore gun owners spend to much time seeking out and being overally obsessed with each and every negative crime strory that happens in the U.S. and around the world in the current day and age of 24/7 365 for profit shock jock news reporting. It's making them overly paranoid when in reality, there are a long list of other things that they have a better chance of being hurt or dying from that they completely overlook and don't give as much attention to.