COLD-HEARTED KILLER: Black Widow Poisoned Husband And His Nine-Year-Old Son With Anti-Freeze, Court Hears

A woman accused of poisoning her partner and his nine-year-old son with anti-freeze two years apart has gone on trial in Argentina.

Karen Leylen Oviedo and her partner, Rolando Angel Aquino, pose in undated photo. She is on trial since Monday, Nov, 28, 2022, and is accused of having poisoned her partner and his 9-year-old son with antifreeze in Guaymallen, Argentina. (Newsflash)

Karen Leylen Oviedo is said to have dosed orange juice with ethylene glycol and forced her partner Rolando Angel Aquino to drink it.

Prosecutors believe she used the same method to kill 35-year-old Aquino’s son Elian in 2019.

Police seized Oviedo when they found a half-used bottle of anti-freeze at the family home in Guaymallen, Mendoza Province, after Aquino’s death in 2021.

And when they checked her smartphone’s internet search history they found ‘what is the most deadly poison’, ‘how to kill with poison’ and ‘how to delete a search history’.

Prosecutor Dr Claudia Rios described the evidence as “overwhelming”.

Elian Elian, 9, poses in undated photo. The girlfriend of his father Karen Leylen Oviedo is on trial since Monday, Nov, 28, 2022, and is accused of having poisoned her partner and his 9-year-old son with antifreeze in Guaymallen, Argentina. (Newsflash)

Paramedics had found Aquino collapsed on the floor of the family home in 2021 after Oviedo called the emergency services.

He died in hospital two days later – the Polo Judicial Prison court heard on 28th November – and an autopsy discovered he had been dosed with ethylene glycol.

An unnamed source close to the investigation reportedly told local media that Oviedo said “that her husband had been feeling bad for several days and that he was taking medicine for some spots on his skin.”

They added: “When we asked her to tell us what medicine, she did not know how to specify it and when we asked her to hand over the bottle, she said that the maid had thrown it away.”

Karen Leylen Oviedo and her partner, Rolando Angel Aquino, pose in undated photo. She is on trial since Monday, Nov, 28, 2022, and is accused of having poisoned her partner and his 9-year-old son with antifreeze in Guaymallen, Argentina. (Newsflash)

But when investigators spoke to the maid she told them she had seen Oviedo mixing a substance into some orange juice she insisted her husband had to drink.

Aquino’s ex-wife then came forward to tell police he had been depressed since the sudden death of his son two years earlier.

Medics at the time reported it as a case of acute poisoning but new tests ordered by police showed that he, too, had been dosed with anti-freeze.

The defence has requested a trial by jury.

Oviedo’s lawyer Luis Torres will reportedly argue that Aquino committed suicide by drinking anti-freeze.

He is expected to claim that it was Aquino who had searched Google for poisons on his wife’s phone and that she had nothing to do with the death of his son.

Karen Leylen Oviedo and her partner, Rolando Angel Aquino, pose in undated photo. She is on trial since Monday, Nov, 28, 2022, and is accused of having poisoned her partner and his 9-year-old son with antifreeze in Guaymallen, Argentina. (Newsflash)

Oviedo is facing two counts of double homicide, aggravated by cruelty and treachery, and faces a life sentence if convicted.

The trial is ongoing.