In November 2016, California voters passed Proposition 66 which sought to speed up the time between a death penalty conviction and sentence and the actual execution. Most notably, Prop. 66 imposed a mandatory five-year deadline for the California courts to finish a capital appeal. Almost immediately after passing, opponents filed a lawsuit challenging the constitutionality of the proposition, and specifically, that five-year deadline.
After reviewing the challenge, the California Supreme Court issued their ruling, in Briggs v. Brown, effectively striking down the five-year deadline (at least for the time being), while upholding other portions of the proposition.