Former Sinn Fein Vice President and MP for West Tyrone since 2001, Pat Doherty has announced he will not seek re-election.
His successor will be local MLA, Barry McElduff, who will be defending a majority of 10,060 votes that the party achieved at the 2015 election.
So far the confirmed candidates are, Daniel McCrossan of the SDLP and Alicia Clarke of the UUP.
David McCann holds a PhD in North-South relations from University of Ulster. You can follow him on twitter @dmcbfs