St Mirren claimed a dramatic 3-2 home win over Motherwell to move out of the bottom two and condemn Hearts to relegation in the process.
Goals from Henri Anier and John Sutton had Well in control but Steven Thompson pulled one back before the break. Kenny McLean hauled Saints level with a late penalty and Thompson struck again 60 seconds later.
Hearts are down despite an impressive 4-2 victory against Partick Thistle at Firhill. Dale Carrick, Billy King and Ryan Stevenson (2) scored for Gary Locke's team, with Kris Doolan and Jordan McMillan on target for the Jags.
Champions Celtic defeated Dundee United 2-0 at Tannadice thanks to first-half goals from Georgios Samaras and Anthony Stokes.
St Johnstone recovered from the loss of an early Robbie Muirhead goal to beat Kilmarnock 2-1 at Rugby Park. Defensive duo Frazer Wright and Steven Anderson netted for the Perth club.
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