In my time, I attended two.
One was counter-ambused by a housebreaker armed with a crowbar and got his revolver snatched. The housebreaker shot him in the head and ran away. A big (but silent) manhunt was of course conducted immediately and we shot him down a few hours later. He died in the hospital.
The other was spotchecking a suspicious behaving character in the middle of the night. Whilst trying to search the backpack, the suspect pulled out an axe and hacked him to death, then ran. The suspect was subsequently arrested, not shot. Turned out to be insane and sent to IMH.
I myself had a close shave with premature funeral when I confronted a gangster armed with a chopper. I pulled out my revolver and demanded he drop his weapon. That bastard flung the chopper at me and started to run. Fortunately, I ducked in time. Furious as I was, I didn't open fire since I would have shot him in the back and he's unarmed already. Though as usual a manhunt operation was launched, that bastard was never caught.
You should have killed him on the spot !!! Or you are afraid to write a thorough report after firing a single bullet.