45-year-old man stood over the victim as he lay on the ground, took videos and pictures of him,
Who does that ? Oh, cool, this should be good for a couple of clicks.
Sounds like some gangland stunt. Send a picture of the deceased to his momma. They do that sort of chit.
Maybe he wanted to confirm that he shot an armed man.
Don’t know the neighboorhood, but in some places it is not unknown for a bystander to take anything of value off the stiff before the coppers show up.