William Parkinson would die in office on October 14, 1869. Lewis Doron was appointed to fill the vacancy on October 15, 1869 and served the remainder of the term.
Source for Popular Vote data: Nevada State Archives, "State Controller," Canvass of Votes Cast at the General Election held in the State of Nevada on the 6th day of November, A.D. 1866 (Carson City, 1866)