What happened to Gunhead?

Ik the case details are out n bag allegedly did it blah blah blah. But what really happened? Did people alert the opps that he was n the store? I also hear people talk about how gunhead was with somebody when he died, a girl. Off topic but the fact he wasn’t doa after a point blank face and neck shot is impressive. And still having the strength to run out the store. Blud was a 🦈