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A serial killer couple who killed 20 victims and reportedly fed their hearts to their pet dogs have been jailed for 654 years.

The sick Mexican couple, dubbed the 'Monsters of Ecatepec' by local media, have received a new sentence of 40 years for the death of an unnamed woman which took place in March 2018.

Like many of the victims who died during their brutal killing spree, the the woman was murdered in the municipality of Ecatepec in Mexico.

In the latest sentence, Juan Carlos Hernandez Bejar, 38, and Patricia Martinez Bernal, 44, have both received sentences amounting to 327 years.

They were arrested October 2018 when they were caught pushing a baby's pram full of human remains in the street .

(Image: CEN) (Image: CEN)

Following a search of their homes, the police found the remains of multiple female victims.

Hernandez Bejar previously admitted to killing 20 women to the cops, according to local media.

The authorities stated that Bernal was responsible for approaching the victims, usually young women, before convincing them to go to her house to sell them some products such as cheese, clothing or perfume.

(Image: CEN) (Image: CEN)

Once the victims went into the house they were killed and dismembered by Hernandez Bejar.

Since May 20, the couple has been sentenced eight times, according to local media.

They have also previously been sentenced to four years in prison for human trafficking after selling the baby of one of their victims.