The shooting occurred in the back of Gipson's Discount Foods, 1434 U.S. 80 in west Jackson.
About 4:50 p.m., police responded to a call of a man being shot at the business, Jackson Police Department Assistant Chief Lee Vance said.
The grocery store is closed on Sundays.
“Our preliminary investigation shows the deceased was attempting to break in when a resident living inside shot and killed him,” Vance said.
The suspect, who did not have any identification, was carrying a large knife and a handgun, Vance said. He was shot when he reached for one of the weapons.
Police found the suspect dead near the rear door.
Hinds County Coroner Sharon Grisham-Stewart said the suspect was shot once in the chest with a shotgun.
She said she hopes finger prints will be able to help identify the suspect, who is believed to be in his mid-20s.
The death is the city's 28th homicide.
Police are not releasing the name of the shooter because he is not expected to be charged. Read more