A US police officer fatally shot a man after a dispute with another man over not wearing a face mask.
Michigan's sheriff's deputy shot the man dead on Tuesday in Eaton County, southwest of Lansing, state police lieutenant Brian Olesky said.
The man was suspected of having stabbed a pensioner who had challenged him about not wearing a face mask at a convenience store, police said.
The shooting happened about 30 minutes after the stabbing at a Quality Dairy store in Dimondale.
A sheriff's deputy spotted the man's vehicle in a residential neighbourhood and shot him when he tried to attack her with a knife, Mr Oleksyk said.
Sean Ruis, 43, of Grand Ledge, who worked at the Michigan Department of Transportation, died at a hospital.
He was suspected of stabbing a 77-year-old man inside the store when he was confronted about not wearing a mask, Mr Oleksyk said.
The stabbing victim was in stable condition at a hospital.
Governor Gretchen Whitmer has ordered people to wear masks in stores to reduce the risk of spreading the coronavirus.
The decision about whether to wear a mask in public for some has become a political statement, and there have been other instances of violent encounters over masks.
In May, a security guard at a Family Dollar store in Flint was fatally shot after denying entry to a customer without a mask.
