I would highly recommend reading "The Law of Self-Defense by Andrew Branca. He is a very prominent self-defense lawyer and completely contradicts this very poor advise. Firstly, when you make a 911 call, you don't want to give details but certain pieces of information are essential. Give them your name and location also let them know that you have been the victim of a crime. "I was attacked, I was in fear for my life and I had to defend myself."

Ask for police and an ambulance. If your attacker is beyond saving, very likely you will need medical services yourself after having tons of adrenaline dumped into your body. Older people have had heart attacks after such an incident and that's better to have in a hospital than in a holding cell. Letting 911 know you are the victim lets them know you are not the threat and sets the tone of the encounter with the police. You are the complainant, not the respondent. Did you admit you defended yourself, of course, but they are going to find that out shortly anyways.

Read Andrews book! It goes into much detail about the 5 pillars of self-defense law. Innocence, Imminence, Proportionality, Avoidance and Reasonableness. You establish several of these things just on the 911 call. Saying "there's been a shooting" and hanging up is probably the WORST advice I've ever heard of. No need to even mention that fact on the 911 call actually. Great way to get the police rolling up hot with their own adrenaline pumping increasing the danger to you and others however.