Dunfermline Athletic inflicted Livingston's first league defeat of the season this evening, running out 3-0 winners at East End Park.
Chris Kane grabbed a double and captain Kyle Benedictus was also on target for James McPake's side to leave Livi four points behind leaders Falkirk.
It also means Airdrieonians are now four points adrift at the foot of the table following their 1-0 defeat to Raith Rovers at Stark's Park, where Scott Brown was the scorer.
Queen's Park moved back into the play-off places thanks to a 1-0 victory over Greenock Morton at Cappielow with a Zak Rudden goal.