Honestly, the more I think about this one... the more the officer is the one at fault.
Standard procedure for a stopped car is to give it a wide birth, staying to its side, until you can come in towards the driver's side door at around a 45 degree angle. So, in order for him to be in fear of his life, two things need to be true.
1: He failed to follow this basic procedure which is standard across the country.
2: He was sufficiently close that he couldn't step aside...
And the problem should now be obvious if you think about it. Somehow, he was far enough away to draw his weapon, fire it, kill the suspect, and for the cars momentum to come to a halt... but somehow not be able to step aside.
That smells like bullshit.