Michelle Martens 'had sex with daughter Victoria's killer Fabian Gonzales 20 minutes after girl's death'

Victoria Martens died as she celebrated her 10th birthday. Photo / Supplied

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A heartless mum allegedly had sex 20 minutes after she watched her boyfriend and his cousin rape and dismember her daughter on her 10th birthday.

Newly released police interviews show Michelle Martens changed her story a few times before she confessed that she watched boyfriend Fabian Gonzales and his cousin Jessica Kelley rape and dismember her daughter, Victoria.

Michelle Martens' story of what happened to her daughter Victoria changed several times. Photo / Supplied

US news site KTLA said Gonzales and Martens had sex just 20 minutes after Victoria was killed.

A coroner said Victoria had been dosed with meth, raped, strangled, stabbed and dismembered.

Martens also admitted that she had watched Gonzales and Kelley rape her daughter at least three time before her death and that she believed Gonzales was abusing her for a month while she was at work.

Martens allegedly told police she used the website Plenty of Fish to find men to have sex with her daughter because she liked to watch.

Michelle Martens' boyfriend Fabian Gonzales was arrested over the death of Victoria Martens. Photo / Supplied

It is believed she named two other men who abused her daughter but police have not confirmed if they are being investigated.

Police found Victoria's body wrapped in a burning blanket in Martens' apartment.

Martens faces charges of kidnapping and child abuse resulting in death.

Gonzales faces those same charges as well as child rape.

Kelley has been charged with kidnapping, child abuse resulting in death and child rape.

Their trials are expected to be held next year.