2018 San Francisco mayoral special election
Ed Lee, who was appointed Mayor of San Francisco in 2011 following Gavin Newsom's election as Lieutenant Governor of California, elected to a full term in 2011, and reelected in 2015, died of cardiac arrest on December 12, 2017. London Breed, the President of the San Francisco Board of Supervisors, became the city's acting mayor.
2015 San Antonio mayoral election
Julian Castro, who was first elected mayor in the 2009 mayoral election, was selected in 2014 to become the next United States Secretary of Housing and Urban Development. Upon that announcement, State Representative Mike Villarreal immediately announced he would run to succeed Castro in the 2015 election. Once Castro was confirmed by the U.S. Senate, the San Antonio City Council selected Ivy Taylor as interim mayor by a third-round unanimous vote becoming the city's first African-American mayor.