If you squint, it looks like attempted murder. They let him off easy.
Wouldn't it be Involuntary manslaughter if he just flew the drone and didn't take care of the airspace?
Now I will grant you, a good defense lawyer would try to claim that killing someone with a remotely operated drone does not constitute "the operation of a motor vehicle, aircraft, or water vehicle that results in injury or death" but if you squint, it just might if they could prove intoxication.
I looked here:
http://leginfo.ca.gov/pub/07-08/bill/asm/ab_0651-0700/ab_678...
And the only single mention of „murder“ is for placing highway signs.