The dispute, at a store in the US state of Georgia, left three other people injured.
A supermarket worker has been killed and three other people injured after she was shot by a customer following an argument about face masks.
The shooting happened in the Big Bear Supermarket in Decatur, DeKalb County, about seven miles east of central Atlanta on Monday afternoon.
The shooter, identified by police as Victor Lee Tucker Jr, 30, of Palmetto, Georgia, had argued with the cashier before leaving the shop without buying anything.
He then returned to the store, walked up to the cashier, pulled out a handgun and shot her, the Georgia Bureau of Investigation said.
DeKalb County Sheriff Melody Maddox said: "There was some confrontation, argument - I'm not sure exactly what - in reference to the wearing of masks, at which time the subject pulled out a weapon and shot the cashier."
She added: "It was over a mask. I don't know if they were wearing, or not wearing.
"The wearing of the mask and not wearing of the mask, people have their own opinion about it and it is very sensitive at this time."
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