Monster disemboweled his girlfriend after she called out her ex-husband's name during sex

Fidel Lopez (left), 26, was jailed for life without parole in Miami for the murder of his girlfriend. Photo/CBS

WARNING: GRAPHIC CONTENT

A man who disemboweled his girlfriend after she called out her ex-husband's name during sex has been jailed for life without parole.

Fidel Lopez, 26, murdered his 31-year-old girlfriend Maria Nemeth at their apartment in Sunrise, Miami, in September 2015.

On Thursday, he apologised to her family as they wept in a Miami courtroom to see him jailed, according to Daily Mail.

Lopez pleaded guilty to murder and sexually battery charges last month as part of a plea deal to avoid the death penalty.

Prosecutors threatened to seek execution unless he admitted to killing Nameth who worked as a leasing agent for a real estate development.

After lashing out and murdering her last year, Lopez pulled her intestines out of her, seemingly with his bare hands, then sexually molested her by inserting a beer bottle and a hair straightener in to her vagina.

He then called 911 to report that she was having trouble breathing. When police arrived, they found the woman's lifeless, mutilated body in the bathroom.

Lopez was sitting next to her crying.

Once in custody, he claimed the pair had been having rough sex when she got up to go to the bathroom, complaining that she did not feel well.

He said she vomited and then passed out.

Police quickly poked holes in his story, pointing to the large pools of blood on the bedroom carpet and blood stains that were found inside a closet.

They also discovered bloody chunks of tissue at the scene.

Lopez murdered 31-year-old Maria Nemeth after she called out her ex-husband's name during sex. Photo/Facebook

Lopez at first pleaded not guilty, sticking by the story he tried to give authorities at first.

He then conceded that the pair had been having sex inside the closet when she called out the other man's name, sending him into a violent rage.

On Thursday, he apologised to the woman's family through a translator.

"I ask for forgiveness. I hope they can find it and I hope that one day they can forgive me," he said, according to CBS which attended the trial.

His mother also appeared in court to apologise to the woman's relatives.

"We'd like to apologise. In the whole sense of the word, we are sorry. Everything that has happened to them has happened to us as well," she said.

Maria's uncle Juan Cavezudo sobbed from the gallery before giving a statement about his slain niece's character.

"It would be very difficult to express it in a few lines," he said of her life, adding: "She was and will continue to be a model of affection, effort, perseverance and love of humanity."