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A teenager handed himself into police and confessed to killing his girlfriend during a row about her being pregnant.

Naim Vera, 19, claimed he had pushed his 24-year-old partner Brenda Micaela Gordillo down a flight of stairs after a night out before attempting to burn her body on a grill.

Her remains were found in a dumpster and at the side of a road, though an autopsy later ruled out that she was actually expecting a child.

The pair had returned to an empty apartment owned by Vera's family in Catamarca, a northwestern province of Argentina, at around 4am on Saturday, newspaper Clarin reports.

(Image: NaimVeraa4/Instagram)

The apartment, which the family planned to rent out, is opposite the National University of Catamarca.

Vera told the police he had rowed with Brenda and after she fell down the steps he wrapped her body in a blanket before trying to burn it.

Officials have not confirmed whether the tragic woman was alive when her boyfriend burned her body, however forensic experts believe she died by asphyxiation due to cloth placed in her mouth.

A piece of the teenager's skin was also found under Brenda's nail, suggesting she struggled with Vera before she died, according to investigators.

Hugo Costilla, a prosecutor for Catamarca, told Argentine state news agency Télam that the victim was not pregnant and Vera had not chopped up her body, despite reports in some media.

"He did not butcher the body, but burned it and, as a result of the fire, the body was dismembered," the prosecutor said.

Vera's father and lawyer went with him to the police station at around midday when he handed himself in, though Mr Costilla confirmed the teenager did not have any assistance in the alleged murder.

(Image: Micaela Gordillo/Instagram)

CCTV footage apparently shows the moment Vera was driving his truck at 8.10am on Saturday along a road where part of his partner's body was later found half buried.

The authorities believe he was driving back home after discarding Brenda's remains.

Part way through the journey he was stopped at a police checkpoint and asked to produce the vehicle's documents before he was allowed to continue.

He is understood to have then returned to the apartment and called a lawyer friend and his father and confessing to both what he had done.

Mr Costilla went on to say some of Brenda's remains were discovered in bags that were left in a dumpster about 65 feet from Vera's family home, while the rest were left eight miles up the road.

The police are waiting to obtain a warrant to search Vera's home to gather other potential evidence.

Brenda's brother Ivan said he and his family did not know Vera personally but described him as a "monster" - having learned of his sister's death through social media, reports Clarin.

“We are all destroyed, my mother is totally beside herself. We have to join forces to seek justice, it is the only thing we have left.

"My sister was a person wanting to live," he said.

With the investigation continuing, Brenda's family and friends called for a march in Plaza 25 de Mayo.