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A Michigan man stabbed a shopper who confronted him about not wearing a mask at a convenience store Tuesday — before being gunned down by law enforcement, authorities said.

Sean Ruis, 43, of Grand Ledge, allegedly stabbed a 77-year-old man who challenged him about not wearing a mask at a Quality Dairy store, state police Lt. Brian Oleksyk said.

Shortly after, a sheriff’s deputy spotted his vehicle in a residential neighborhood in Eaton County, Oleksyk said.

When he allegedly tried to attack her with a knife, the deputy shot him, police said.

Ruis, who worked at the Michigan Department of Transportation, was brought to a hospital, where he died.

The stabbing victim, meanwhile, was in stable condition at a hospital.

Gov. Gretchen Whitmer has ordered people to wear masks in stores to help prevent the spread of coronavirus.

With Post wires