I am doing some research right now on Washington case law. I am looking at a case, State v. Hanton, 94 Wn.2d 129, (1980) with almost the exact same fact pattern as here: Petitioner and the victim were driving their respective automobiles in Bellevue, Washington, on February 25, 1977. While leaving an intersection, petitioner pulled in front of the victim's car in such a manner as to cut him off, causing him to apply his brakes to avoid an accident. This apparently made the victim quite angry, for he followed close behind petitioner's car until they stopped at the next stoplight. There the victim left his car, came up to petitioner's car, opened the door, and attempted to pull him out. Petitioner thereupon drew a pistol and shot him. He died several days later as a result of the wound. Petitioner was charged with and convicted of first degree manslaughter.
At appeal, the Supreme Court reversed the conviction and remanded for a new trial on the issue of giving a self-defense jury instruction without allocating the burden of proof for a self-defense claim. He was apparently convicted again at the second trial.
Another case, State v. Walker, 136 Wn. 2d 767 (1998) had the following findings: [2] Homicide - Self-Defense - Reasonable Apprehension of Harm - Subjective and Objective Test. A defendant, charged with a homicide offense is entitled to a self-defense instruction only if the defendant produces some evidence tending to prove that the homicide occurred in circumstances amounting to self-defense. One element of self-defense is that the defendant must have had a reasonable apprehension of great bodily harm. A reasonable apprehension of great bodily harm is determined by applying a mixed subjective and objective analysis: Whether the defendant's apprehension is subjectively reasonable is evaluated from the defendant's perspective in light of all the facts and circumstances known to the defendant at the time of the incident. Objective reasonableness focuses on what a reasonably prudent person similarly situated to the defendant would have done under the circumstances.
[3] Homicide -Self-Defense - Instruction - Necessity - Sufficiency of Evidence - Review. A defendant charged with a homicide offense is not entitled to a self-defense instruction unless sufficient evidence is produced tending to support the defendant's claimed good faith belief that deadly force was necessary to fend off the victim and that the belief, viewed objectively, was reasonable. A self-defense instruction is not warranted if the trial court either finds that the evidence presented by the defendant does not support the defendant's claimed good faith belief that deadly force was necessary (a factual finding reviewed for an abuse of discretion) or finds that no reasonable person in the defendant's shoes could have perceived a threat of great bodily harm under the circumstances then present (a legal finding reviewed de novo for an error of law).
For some reason, the Washington appellate database is now having problems, so I will try again later, and will post on any additional cases that I find. The first case, in particular does confirm pretty much what the SCSO deputies and WSP troopers told me about a charging offense if you shoot the assailant and they die. The first case also illustrates that if someone is trying to drag you out of your car, you are not justified in using deadly force. I had thought that you were justified, so I will be changing my mind about that post haste.
What I also read on some of the other self-defense appellate cases also is tending to confirm my thoughts that shooting an unarmed assailant will rarely, if ever, get you a successful self-defense claim to criminal prosecution. Again, these cases I am reading are Washington law, and have no force or precedential value outside of Washington. Your state laws may vary, and you would need to research your own state case laws before drawing any conclusions germane to your own jurisdiction.
PS: The database is still having search problems at 22:25, so I will try again tomorrow.