Cristina D'Avila Teixeira Rodrigues, 24, was arrested in Brazil for allegedly executing the businessman with a shot to the back of the head.
She handed herself into police in the city of Manaus on March 8, three days after the alleged crime.
The victim, Paulo Roberto Moraes Teixeira Junior, 29, owned an internet installation company, where he met his former partner.
A military police report he was fatally shot on Friday afternoon with a .380 calibre pistol.
Paulo Roberto was rushed to hospital, but died on March 7.
According to Rodrigo, the victim's brother, Rodrigues killed her ex because he refused to pay for her silicone breast implants, which can cost around £1,300 ($1,800) in Brazil.
He told local media: "He gave her a car, a job, money.
"She wanted silicone, but in times of pandemic, the company was cutting costs and he could not give her this surgery.
"They fought a lot because of this on the night she took my brother's life."
The victim's sister, Roberta, told local media her brother employed her at his company and they had a year-and-a-half-long relationship.
She said: "From what we saw, she was just with him out of self-interest. She liked to show off, but she never posted anything about him.
"It seems he discovered something serious about her and they broke up."
According to Roberta, the suspect went to the victim's house and said she wanted to speak to him.
Hours later, his family was told he had been shot.
According to Diario Manauara, she was arrested, but claimed the shooting was accidental.
Chief Marilia Campello, deputy of DEHS, said: "Cristina confessed to the crime, but claimed she had no intention of killing Paulo Roberto.
"She said the businessman had two firearms, one in the house and the other in the car.
The investigation is ongoing.
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