A woman who was busted thanks to her Google search history for poisoning her husband and her stepson has been jailed for life.

Karen Leylen Oviedo, 31, had been accused of poisoning her partner Rolando Angel Aquino and his nine-year-old son Elian with anti-freeze two years apart and had gone on trial in Argentina.

She was accused of having dosed orange juice with ethylene glycol and giving it to her partner to drink on Sunday, 7th February 2021. She then called an ambulance and opened the door to them with a big smile on her face, the court heard.

Rolando was quickly transferred to the Santa Maria Clinic in the city of Mendoza, in Mendoza Province, where he died two days later on 9th February.

He was autopsied and it was determined that he had been poisoned with ethylene glycol, which is found in antifreeze and engine coolant and which affects the liver and heart and can be fatal.

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.

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

The prosecution also argued she used the same method to kill 35-year-old Aquino’s son in 2019.

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

Paramedics had found Aquino collapsed on the floor of the family home, which doubled as the neighbourhood corner store, after Oviedo had called the emergency services.

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.

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 had requested a trial by jury. Oviedo’s lawyer Oscar Torres, argued that Aquino committed suicide by drinking anti-freeze.

He argued 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 was accused of two counts of homicide, aggravated by cruelty and treachery. Her lawyer tried to argue that it was her husband who had bought the antifreeze but her search history showed that it was in fact bought by Oviedo.

She was found guilty by the jury, with judge Diego Lusverti sentencing her to life in prison. It is unclear if she plans to appeal.