With all boxes opened in the Donegal South-West by-election , Pearse Doherty has won 39.75% of the first-preference votes, according to the tallies, and is significantly ahead of Fianna Fáil's Brian O' Domhnaill on 21.2%.

Counting is underway in the by-election in Donegal South West, with Sinn Féin's Pearse Doherty apparently on course to take the seat.