The resignation of state Rep. Dan Miller on Dec. 17, 2025, triggered a special election to fill the remainder of his term. Soon after Miller resigned, House Speaker Joanna McClinton set the special election for Tuesday, Feb. 24.

All precincts in the 42nd House District will be open for voting that day. In addition to Mt. Lebanon, the district includes Baldwin Township, Castle Shannon, Dormont and parts of Upper St. Clair.

Democratic committee members from those communities voted Jan. 3 and selected Dormont resident Jen Mazzocco as their candidate. She defeated Upper St. Clair resident Alliyson Feldman to receive the Democratic nomination.

According to John Schnaedter, executive director of the Republican Committee of Allegheny County, Joseph Leckenby was selected by the chair, vice chair and secretary of the county committee in accordance with Section 6.3 of the Republican Committee of Allegheny County bylaws.

The winner of the Feb. 24 special election will serve out the remainder of Miller’s term, which runs through the end of 2026. The seat will also appear on the primary and general election ballots in 2026, and additional candidates may come forward to compete for a two-year term beginning in 2027.