The thing about
this story is, that's one HORRIBLE lie if the officers are lying. Which leaves me inclined to believe they're telling the truth. I mean, can someone REALLY tell that dumb of a cover up story?
My best guess...small derringer type pistol in the back of his waistband got missed in the patdown, he pulls it, tries to shoot a window out, bullet ricochets off bullet proof window (or some other part of the car if the windows isn't bullet proof and his aim was just bad from behind his back with cuffs on) and hit him in the head.