California Code, Labor Code - LAB § 5406.7

(a) In addition to the timelines established pursuant to Section 5406, proceedings for the collection of the benefits provided by Article 4 (commencing with Section 4700) of Chapter 2 of Part 2 may be commenced after 240 weeks from the date of injury and no later than 420 weeks from the date of injury, but in no event more than one year after the date of death, if all of the following criteria are met:

(b) This section does not apply to claims for the collection of benefits pursuant to Article 4 (commencing with Section 4700) of Chapter 2 of Part 2 that have already been adjudicated, or otherwise finalized, or for which the commencement period lapsed on or before December 31, 2014.

(c) No dependency death benefit shall be payable pursuant to proceedings commenced more than 240 weeks from the date of injury unless either no proceedings were commenced within 240 weeks from the date of injury, or, if proceedings were commenced within that period, it has been finally determined that no person is entitled to dependency death benefits pursuant to the proceedings that were commenced within that period.