In Texas, all homicides go to the grand jury.
Hollywood does make things difficult. I'm giving a lecture on wound ballistics and selection of defensive handguns, and I think about a third of it will be trying to dispel Hollywood myths. People do not get blown back 6 feet with a 44 magnum, people do not die instantly. They don't sit and give you words of wisdom then just go limp. The only round that I have seen that stopped a person instantly every time, were direct hits with 40mm grenades, and those are too heavy to carry around every day.
One thing they didn't cover, on TV, someone shoots someone, and is still on the investigation 20 minutes later.