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A woman suspected of heading a league of assassins for a Mexican cartel has been mysteriously found dead in her lover's bed.

Claudia Ochoa Felix, known as 'Emperatriz de Los Antrax' (Anthrax Empress), is believed to have carried out multiple killings for the Sinaloa Cartel - claims which she always denied.

The notorious crime syndicate was once headed by drug lord El Chapo before his extradition and imprisonment in the US.

Felix was found dead in a house in Isla Musala in the city of Culiacan in the north-western Mexican state of Sinaloa.

According to local media, the 35-year-old woman died of a suspected pulmonary aspiration, although it is currently unclear whether she was the victim of foul play.

(Image: CEN)

Aspiration occurs when someone breathes foreign objects such as fluids into their lungs, which can cause choking and death.

Reports said that she went to a nightclub in the city and returned to a man's house later that night.

When the man tried to wake her up, she did not respond and he called the local authorities.

(Image: CEN)

Her body has been taken to a forensic lab to undergo an autopsy.

According to local media, the alleged assassin worked as a model and was romantically linked to Jose Rodrigo Arechiga, better known as 'El Chino Antrax' ('The Chinese Anthrax'), who headed the Anthrax gang that is connected to the Sinaloa Cartel before his imprisonment.

Reports also said that she was married to a drug trafficker with the Sinaloa Cartel nicknamed 'El Chavo Felix', with whom she had three children.

(Image: CEN)

(Image: CEN)

In 2016 she gained notoriety after posing with a pink AK-47 and being photographed with masked and armed bodyguards.

After Chinese Anthrax was arrested, Felix then became the Anthrax group's leader and the cell followed the orders of Sinaloa

Cartel leader Ismael El Mayo Zambada to carry out hits, according to local media.

Prosecutor Juan Jose Rios Estavillo said that alcohol and other substances were found in Ochoa Felix's body and that she died of suffocation, but they are waiting for the autopsy results to learn more.

The investigation is ongoing.