Lieutenant Governor-elect George Robinson was killed in a mine accident in November of 1880, after the election but prior to taking office. Incumbent Lieutenant Governor Horace Tabor remained in office and served out Robinson's term.
Candidates' party affiliations obtained from the 11/7/1880 Rocky Mountain News (of Denver). https://www.coloradohistoricnewspapers.org/?a=d&d=RMD18801107-01.1.4&e=-------en-20--1--img-txIN%7ctxCO%7ctxTA--------0------
Source for Popular Vote data: Colorado General Assembly. Senate Journal of the General Assembly of the State of Colorado Third Session, Colorado General Assembly (https://babel.hathitrust.org/cgi/pt?id=uiug.30112108077667&seq=68) (accessed 09 Dec 2023)