Manoel Moisés Cavalcante, 59, (also known as Moisés Santos) was working at a Carrefour Brasil, one of the biggest retail chains in the country, when he suffered a heart attack and died.
Paramedics were called to the scene on August 14, but the shop worker could not be saved.
Images of Mr Cavalcante’s lifeless body have since gone viral online, causing outrage among social media users shocked at the store’s handling of the situation.
“This is the body of a deceased worker in the middle of the Carrefour supermarket,” one wrote on Twitter alongside the photo.
“He died while working and was covered with umbrellas. Witnesses say the supermarket functioned normally.”
It has been reported that his body remained in the open store for more than three hours, covered with umbrellas and several cardboard boxes as staff continued to welcome customers into the store.
“How they treated the death of this worker should be enough reason for a revolt,” a Twitter user wrote.
“They didn’t even care about the family’s pain. It’s a lot of lack of respect for the human being,” wrote another.
Others called the move “absurd”, “morbid” and “disgusting” in tweets that have been roughly translated from Portuguese.
Following the backlash, the store has since issued a statement on Twitter apologising for not closing the store immediately, admitting it was a mistake and they have now changed the protocol.
“The unexpected death of Mr Moisés Santos, victim of a heart attack, was very sad for us at Carrefour,” a translation of the statement read.
“We are sorry and, because of what happened, we revisited the protocols to implement the mandatory closing of stores for fatalities like this.
“We are available to support the family at this time.”
The incident occurred at a store in the northeastern state of Recife on August 14 when the man began to feel sick, according to the store.
However, it only came to light this week, amid the deluge of criticism that the body was not removed and the store did not close.
“The company made a mistake by not closing the store immediately after what happened while waiting for the service funeral (sic), as well as (it) did not find the correct way to protect Mr Moses’ body,” Carrefour added.
“We apologise to the family and stand ready to support them in whatever way necessary.”