In 1967, McAteer, a Democrat, announced his intent to run for Mayor of San Francisco in the November election, opposing the Democratic incumbent John F. Shelley as well as perennial Republican candidate, Harold Dobbs. The campaign was cut short by McAteer's untimely death at age 51 in May of that year, while playing handball at the Olympic Club's downtown facility. Shortly thereafter, attorney Joseph L. Alioto, then working on the McAteer campaign, entered the race and subsequently won that fall's election, eventually serving two terms in the office of Mayor.
References
^"Gene McAteer". JoinCalifornia: Election History for the State of California.