Buron Fitts resigned on November 30, 1928 to become District Attorney of Los Angeles County. The governor, C. C. Young, appointed Herschel L. Carnahan to fill the vacancy on December 4th and Carnahan served the remainder of the term.
Source for Popular Vote data: California Secretary of State. Statement of Vote at General Election Held on November 2, 1926 in the State of California, California Secretary of State (https://archive.org/details/statementofvote192430cali/page/n205/mode/2up?view=theater) (accessed 14 Dec 2023)