Everyone please join me in a moment of silence for Vastator and OffensivelyOpenMinded's brains. Unfortunately they've passed on to hopefully a better place.
You're letting your emotions control your thoughts, bud. I never said he doesn't bare any responsibility in what happened, so get off your high horse already. Facts are he didn't hit her with the car and no car hit her, she died of a heart attack...so how the heck can the hit him with a murder rap? They can't and if they decide to go full on with the murder charges, instead of charging him with manslaughter...then Fields will be a free man sooner than you think.
You have no way to read the guy's mind, you don't know if he deliberately meant to run into the crowd. In most cases where someone uses a vehicle to run down people, the attacker doesn't drive straight into other cars, they swerve on the sidewalks so they can inflict maximum damage. I think he got scared and his survival instinct kicked in and he just hit the gas. So in my opinion, that may call for manslaughter charges, but not murder. Especially when she didn't get hit by the vehicle, but had a heart attack.