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'SERIAL KILLER DOC' - Mum And Son Prime Suspects In Three Poisonings In Grim Twist - Article cover image
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'SERIAL KILLER DOC' - Mum And Son Prime Suspects In Three Poisonings In Grim Twist

Nina Trajkov's profile
Nina Trajkov
A mother and her surgeon son accused of poisoning his wife when she discovered his affair are now prime serial killer suspects after police exhumed his sister's remains.
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A mother and her surgeon son accused of poisoning his wife when she discovered his affair are now prime serial killer suspects after police exhumed his sister's remains.

Pilates instructor Larissa Talle Leoncio Rodrigues, 37, had been found dead in her apartment in Ribeirao Preto, in the state of Sao Paulo, Brazil, after being dosed with poison.

An autopsy revealed that she had died from 'chumbinho', a powerful pesticide often used in homicides.

Nathalia Garnica

Nathalia Garnica poses in undated photo. Police said she was also poisoned after she died in Ribeirao Preto, Brazil, in March 2025. Note: Private photo. (Newsflash/NX)

Her husband Dr Luiz Antonio Garnica, 38, and his 64-year-old mum Elizabete Arrabaca were arrested on 6th May after police unearthed their attempts to buy the poison.

Now in a grim twist the pair are prime suspects in the mysterious death of Garnica's sister Nathalia Garnica a month earlier after police re-opened the case.

Nathalia, 42, had died in February in what was believed to be a sudden heart attack.

Luiz Antonio Garnica

Picture shows Luiz Antonio Garnica, during arrest, undated. He was arrested on suspicion of involvement in the death of his wife in Ribeirao Preto, Brazil. Note: Private photo. (Newsflash/NX)

Now forensic tests on her exhumed remains has revealed on 16th June that her body contained traces of the same poison that killed her sister-in-law.

The findings came as Nathalia's mother bizarrely tried to blame her for Larissa's death.

In a letter she claimed that before she died her daughter had dosed heartburn capsules taken by Larissa with 'chumbinho'.

Arrabaca admits giving Larissa one of the capsules the night before she died as a treatment for indigestion.

And she wrote: "The conclusion I've come to over these past days, praying a lot and pleading for divine guidance, is that Nathalia must have put the poison into the capsules.

Nathalia Garnica

Picture shows the exhumation of Nathalia Garnica's body, undated. Police said she was also poisoned after she died in Ribeirao Preto, Brazil, in March 2025. Note: Image is a screenshot from video. (Newsflash/NX)


"There's no other explanation. Sadly, I've lost two daughters."

Now a third case is also being investigated after an alleged victim came forward saying they survived a suspected poisoning bid by Arrabaca seven years ago.

Police believe Larissa had planned to divorce Garnica after uncovering an 18-month affair with an unnamed 26-year-old student.

She had confided to friends about her intentions to leave and confronted Garnica when she fond " incriminating items" in his car.

Larissa Rodrigues

Professor Larissa Rodrigues poses with husband and their dog Pandora in undated photo. She died in Ribeirao Preto, Brazil. Note: Private photo taken from social media. (Newsflash/NX)

Garnica claims to have found Larissa unresponsive in the bathroom early on 22nd March and attempted to revive her.

But paramedics noted that rigor mortis had already set in, indicating she had already been dead for some time.

They also reported a strong smell of cleaning products in the apartment, believed to be an attempt to destroy evidence.

Police discovered that Arrabaca had sought to purchase 'chumbinho' two weeks prior to Larissa's death.

And prosecutors believe Garnica chose to kill his wife to avoid demands for a huge financial settlement for the end of their 18-year marriage.

Larissa Rodrigues

Professor Larissa Rodrigues poses with husband in undated photo. She died in Ribeirao Preto, Brazil. Note: Private photo taken from social media. (Newsflash/NX)

Investigators say they the medic and his mother were tipped off about Larissa's plans when she told her she thought Garnica was having an affair.

Garnica and his mother are being held behind bars in pre-trial detention.

The investigation is ongoing.

(Simona Kitanovska / newsX)

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