A by-election was held on 2 March 2019 for the Selangor State Legislative Assembly seat of Semenyih. The seat became vacant after the death of the incumbent assemblyman, Bakhtiar Mohd Nor, 57, on 11 January 2019 from heart attack. Bakhtiar was a member of the Malaysian United Indigenous Party or Parti Pribumi Bersatu Malaysia (BERSATU), a component of Pakatan Harapan (PH) coalition. Zakaria Hanafi from Barisan Nasional won the by-election. This was the first time a seat was gained by another party after the 14th General Elections.