Well, according to the Jury it(the BART train shooting) was Involuntary Manslaughter. 2-4 year prison sentence with a possibility of up to 10 years added for use of a firearm in commission of the offense.
Ex-officer convicted in Calif. train killing - Yahoo! News
It was the least finding of guilt the jury could have found him guilty of, and there was either 0 or 1 black member of the jury. Not really sure how to think on this one.