California Code, Penal Code - PEN § 4805

(a) At least 10 days before the Governor acts upon an application for a commutation of sentence, written notice of the intention to apply therefor, signed by the person applying, shall be served upon the district attorney of the county where the conviction was had, and proof, by affidavit, of the service shall be presented to the Governor.

(b) The district attorney may submit a written recommendation to the Governor for or against commutation of sentence.

(c) The district attorney shall make reasonable efforts to notify the victim or victims of the crime or crimes related to the application and the victims' families who may also submit a recommendation to the Governor for or against commutation of sentence.