The victim, a man in his 60s, was discovered by a colleague, buried under grain delivered by a dump truck.
The first officers on the scene began administering CPR on the unconscious victim. He was brought to hospital in Saint-Jean-sur-Richelieu where he was later pronounced dead, said SQ spokeswoman Audrey-Anne Bilodeau.
Quebec's workplace safety watchdog, CNESST, is investigating, but the police say the death is not criminal.
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One man died Sunday afternoon after being buried by grain at a farm in Marieville, Quebec, just north of St. Jean sur Richelieu.
Emergency crews rushed to the farm around 4:45 p.m. Sunday to help the man, a farm worker in his sixties, who was buried in grain being offloaded by a truck.
Sureté du Quebec officers and paramedics uncovered the man and performed CPR until he arrived at hospital, where his death was pronounced a short time later.
The CNESST is going to investigate the death to determine what happened and see how similar incidents can be prevented in the future.