It depends on whether it was done intentionally and with reckless disregard for human life. If the drone operator was intoxicated and caused the plane to crash it could very well be vehicular homicide.
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.