I just looked and I can't find any updates newer than April - the rider was 21 yr old Joseph Robinson and the drunk 18 yr old was Sommer N. Gonzales.

Biking LA writes:
A preliminary hearing reveals 18-year old Sommer Gonzales had failed two drug tests while on probation for undisclosed crimes. And yet somehow, she was still allowed on the road to kill 21-year old cyclist Joe Robinson while driving under the influence.

Nice.
Gonzales has additional court hearings scheduled for May 19th and June 6th.