A man accused of murdering his mother and aunt in Argentina made a desperate plea for help to find them while sitting above the grave he allegedly buried them in.

The mutilated bodies of Lily Pereg, 53, and her sister Pyrhia Sarusi, 63, were found in a shallow grave in the city of Mendoza on January 26.

Only two days prior to the grim discovery, Ms Sarusi's son Gilard Pereg, 36, gave a press interview begging for their return in which he posed for a photo sitting next to a pile of rubble where the bodies were later found.

The photo was circulated by local media as the family pleaded for information regarding the pair's disappearance.

Dr Pereg, a microbiology professor from Australia, was in the country with her sister visiting Ms Sarusi's son when the pair disappeared.

Dr Pereg's partner, John Finlay, had spent two weeks scouring Argentina in the hope of finding the pair, only for the search to come to an abrupt end on Saturday.

Mr Finlay said he spoke with Gilard while he was overseas, who assured him he had no idea what had happened to the two women.

Both Dr Pereg and Ms Sarusi's bodies were found in the abandoned lot featured in the photograph, next door to Mr Pereg's unit.

Police have since charged Mr Pereg with the murder of his mother and aunt, and allegedly found a bag covered in spots of blood during a search of his home.

Several registered guns, a cut security camera cable and dissected cats were also found inside the home, the ABC reports.

Prosecutor Claudia Rios told local media there was allegedly security vision showing the two missing women entering the property with him.

'We don't have vision of them leaving the property,' Ms Rios said.

Local media allege Mr Pereg has denied having any involvement in the killings, placing the blame on criminal criminal gangs from Bolivia and Israel.

Mr Pereg, a former Israeli soldier, was allegedly drowning in debts owed to criminal organisations and told his mother he was bankrupt before she arrived in the country.

Other reports claim he had a fascination with Nazi Germany and often introduced himself as Floda Reltih - which is Adolf Hitler spelled backwards.