OTTAWA — Nathan Cullen, one of the NDP's best known and most effective MPs, is calling it quits.
He's announcing he won't seek re-election this fall.
That makes 13 of the 44 New Democrats elected in 2015 who won't be running again.
Cullen's departure is a blow to NDP Leader Jagmeet Singh, who just won his own seat in the House of Commons in a British Columbia byelection earlier this week.
Had Singh lost the byelection, Cullen would have come under heavy pressure to run for leader.
Cullen has represented the northern B.C. riding of Skeena-Bulkley Valley since 2004.
