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Woman who 'poisoned husband and his son with anti-freeze' caught out by search history

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 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".

Karen Oviedo allegedly put the toxic chemical in orange juice and made her husband, Rolando Angel Aquino, drink it (

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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."

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.

Nine-year-old Elian Elian was also poisoned by the girlfriend of his father, prosecutors say (

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Newsflash)

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.

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

The trial is ongoing.