'Jealous' girl, 13, 'killed her dad after she fell in love with her step mum'

A 13-year-old stabbed her father after falling in love with her stepmother and wanting to have a relationship with her, police say.

The teenager is said to have stabbed Alex Ferreira, 33, in the chest with a household knife on Sunday evening, after he discovered how deeply she was in love with his wife.

Before committing the crime, the schoolgirl, who lived with her grandmother, is said to have drunk several cans of beer to “build up the courage” to do it, authorities in Brazil say.

The couple apparently argued the night before the deadly attack after the victim found text messages and a letter from his daughter to her 20-year-old stepmother.

The letter promised a platonic love for the woman and implored her to divorce her father so they could live together.

Police released a photo of Alex and said he allegedly scolded his daughter, saying her “passion” was misplaced.

Relatives claimed that the adolescent became enraged after being reprimanded and apparently held a grudge against her father.

After drinking the alcohol, she thought she was walking to her father’s house, a block from where she lived in Jataí, Goáis, and banging on the door to wake them up.

Police spokesman Antonisio Nunes told TV news Balanço Geral that the stepmother opened the door.

'Jealous' girl, 13, 'killed her dad after she fell in love with her step mum'

“She told us that her stepdaughter repented after arguing with her father and claimed she had come to make peace with him,” he said.

“She told the girl that her father was sleeping in their bedroom, but he would probably like to get up so they could ‘make up’.”

It is reported that the girl hid the knife in her clothes before entering the property and pulled it out when she entered the bedroom.

Officer Nunes said, “The victim’s wife told us that her husband was just about to get up when the girl jumped to her father and stabbed the knife in his chest.”

'Jealous' girl, 13, 'killed her dad after she fell in love with her step mum'

The weapon allegedly used in the crime was found covered in blood in the house.

Alex was rushed to Dr. Seraphim de Carvalho, where he was pronounced dead on arrival.

His daughter had already fled the building, but was found ‘sitting quietly’ on the sidewalk in front of her grandmother’s house a few meters away.

When questioned, she confessed to the crime and admitted that she had ‘fallen in love’ with her stepmother and was jealous of her relationship with her father.

'Jealous' girl, 13, 'killed her dad after she fell in love with her step mum'

She claimed she “lost it” after arguing with her father who “threatened to stop her from visiting them” if she continued her crush.

A relative who declined to be named claimed that the girl’s ‘puppy love’ had been going on for several months prior to the tragic event and that it was an open secret among family members.

He said, “Her stepmother told us she was aware of her stepdaughter’s obsession, who never encouraged her.

“She made it clear to (her stepdaughter) that she loved her father and just wanted to be a good mother to his child.”

'Jealous' girl, 13, 'killed her dad after she fell in love with her step mum'

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He said the family is devastated by the violent act and is struggling to come to terms with the “senseless loss.”

“Everyone thought it was a passing phase that she would grow out of,” he complained.

The teenager was arrested and initially held at the local police station before being transferred to a juvenile detention center.

She is charged with murder and has yet to hire a lawyer to defend her case.

Under Brazilian law, her age means that she can serve up to three years in prison with socio-educational measures to rehabilitate her back into the community.