Mustafa Kayirici, 31, was found guilty of many crimes, with 42 charges against him in two different trials. The judge sentenced him to 38 years in prison.

The man committed several sexual abuse charges over six weeks. He was found guilty of aggravated sexual assault with a person under 16 and using a child under 14 years to create child abuse content.

Among the woman Kayirici raped was a thirteen-year-old girl. In total, he assaulted seven women, one of whom died before she could get justice.

In August last year, he was facing a sentence of 34 years in jail for committing a five-hour-long sexual assault on a child.

In the same year, Kayirici received a 38-year sentence for rape and robbery.

Recently, it was confirmed that Kayirici died in prison due to an incurable disease. Initially, he was found unresponsive in his cell before being taken to the Prince of Wales Hospital, where he was pronounced dead.

Circumstances leading to his death are being investigated by the NSW Police and Corrective Services NSW.

Last year, he had been diagnosed with a terminal illness and was still getting chemo in prison before he died. The pedophile had been given just 12 months to live.

As he was sentencing him, the judge said that Kayirici was so evil that his last sentence would only come into force in September 2041.

If he could have lived long enough to serve his sentence, Kayirici would have been freed in 2066. At the time, he would have been 76 years of age.

He began committing the crimes in May 2016 when he targeted a sex worker at an apartment block in Sydney's CBD. Kayirici also threatened her with a butcher's knife.

He met another escort in Parramatta on the same day and carried out a similar attack.

The woman said that Kayirici was "aggressive and dominant." He also called her a slut and spat in her eye before beating and raping her.

She revealed that she had to fight for her life. The rapist told her that he loved seeing fear in people's eyes, knowing they couldn't do much about it.

A week after the attack, he robbed a sex worker at knifepoint in her Parramatta apartment. He also robbed another woman in her home.

On May 27, the rapist continued on his rampage and threatened 22-year-old Dasha Volnoukhin with a butcher's knife. Dasha was a Canadian model and escort living in Parramatta.

He was recorded on video as he walked with her through the lobby of Fiori Apartments in Parramatta. They then got into a lift before he assaulted her.

The treatment she faced while with him resulted in her death before he was even sentenced. The reason for her death was not made public.

As soon as Dasha let him into the apartment, he took a knife from a kitchen drawer and asked her to take off her clothes.

As soon as she saw the knife, she screamed, and he quickly warned her to keep quiet and take off her clothes.

Dasha was wearing shorts and a tank top. She was terrified and so took off her clothes because she was afraid something worse might happen to her if she didn't.

Kayirici then recorded himself as he was sexually abusing her. He was also asking her if she liked being raped.

The depraved rapist then started to tell her to say she was a slut.

She was raped for three to four minutes before he took all she had made that day and took off.

Three days after the incident, he attacked and raped another woman while threatening her with a knife.

Then on June 19, he raped another woman while calling her a "little dog."

It seemed like he was totally out of control as his crime spree continued. On June 26, he tricked a teenage girl into his car.

Kayirici drove off with the teenager to an underground parking lot. When they got there, he made her undress and watch porn videos.

He then told her that she would be "raped one day or another" before forcing her to do sexual acts. He had to threaten her with a knife when she seemed reluctant.

After that, he drove her to another basement and made her do other sexual acts. The media also reported that he attempted to get another girl to join them in 10 different locations.

After his attempts to find another girl failed, he took the teenager to a supermarket where they bought duct tape and razors. While there, she tried to make eye contact with one of the workers, but she had to stop when Kayirici lashed out at her.

After that, he raped her several times in his car before leaving her at a train station in Auburn.

Following the ordeal, he gave her $5 and said he was sorry. Nevertheless, he still threatened her that he would release the videos if she told anyone about what had happened.

"How would you like it if your dad saw that... I can hold it against you."

While giving her statement, she said that she at times felt that she would be "better off dead." She also lived with a constant fear of being humiliated after the attack.

In the end, Kayirici was found guilty of 42 charges at two different trials. These included 12 charges of aggravated sexual assault with a person under 16 years of age.

He also faced 12 charges of using a child under 14 to create child abuse material.

The police arrested Kayirici while he was trying to flee in a silver Ford Sedan. He refused to stop but was finally caught when he crashed into a parked vehicle.

According to witnesses, he went through a footpath before he finally came to a stop.

He was resisting any attempts by the police to put him under arrest.

After his arrest, Kayirici was taken to Waverley Police Station, and then he was taken to St Vincent's Hospital.

In June 2016, he appeared in a bail court through a video link. He insisted on his innocence.

Kayirici said he was being made to look like an evil person, a pedophile, and a rapist predator.

Kayirici defended himself by saying he had filmed the women he had sex with as evidence that he had their consent.