A 14-year-old girl died just days after she had a boob job and butt lift without her father’s knowledge — with her mom’s plastic-surgeon boyfriend now under investigation for possible negligent homicide, according to reports.

Paloma Nicole Arellano Escobedo died Saturday in a hospital in Durango, Mexico, after being in a coma with a swollen brain and heart problems following the secret surgery a week earlier, according to local newspaper El Siglo de Durango.

The young teen’s dad, Carlos Arellano, was told she had died from complications from Covid-19 — only finding out that she’d actually had plastic surgery when saying his final goodbyes.

“At the funeral, some relatives told me her breasts were larger than what she had before, and when I mentioned it to her mother, she told me it wasn’t true, that she didn’t know anything,” the grieving dad told prosecutors, according to AZ Central.

He got his ex’s family to leave the room, so his mother, sister and sister-in-law could help him examine his daughter’s body.

“Sure enough: she had breast implants. We have photographs of the implants and the scars. We immediately requested an autopsy,” he said in the complaint.

Arellano said his ex-wife had agreed to the surgery, which was carried out by her current partner, a 45-year-old plastic surgeon only identified as Víctor “N,” who owned the practice.

He accused his ex and her new man of lying to him in a “cover-up,” directly blaming them for his daughter’s death.

While Mexico does not have specific age limits for plastic surgery, they are typically only given to those under 18 with both parents’ permission.

“We are investigating a probable lack of care on the part of the mother” for “placing a minor who was under her care and custody in risky situations,” said Yadira de la Garza Fragoso, Durango Attorney General, according to AZ Central.

The surgeon has had his license suspended and is being investigated for malpractice — and potentially more serious crimes depending on the final autopsy, which could take 10 days or more, the prosecutor said.

“There could be a crime of negligent homicide, and probably medical-professional liability,” the attorney general said.

The dead girl’s dad has since launched a campaign warning of the dangers of such surgery, with a march organized for Friday under the slogan “girls don’t need implants,” according to AZ Central.

“We cannot continue to normalize the sexualization of girls or allow the ambition of some adults to put their lives at risk. We demand justice and that this crime does not go unpunished,” Arellano posted on his Instagram account.

“Girls deserve to grow up free, safe, and respected.”