Cal. Gov. Code § 21621

If the beneficiary of a member retired under this system is entitled to receive a comparable lump-sum death benefit from any other retirement system supported, in whole or in part, by public funds in which he or she was a member in employment subsequent to his or her last employment in which he or she was a member of this system, no payment shall be made under Section 21620, 21622, 21623, 21623.5, or 21623.6 providing for payment of a lump-sum death benefit to a member’s designated beneficiary.