Thomas Kokoraleis (pictured) is set to be released in September unless prosecutors can stop it

An infamous Chicago killer who was a member of the Ripper Crew, believed to be responsible for killing as many as 20 women in the 1980s, is expected to be paroled in September.

Thomas Kokoraleis, 59, is due for release after serving half of his 70-year-sentence for killing Lorraine Borowski who was just 21-years-old.

The Ripper Crew was a gang of four men that stalked and terrorized the streets of Chicago in the '80s, hunting for women.

They would cut women's breasts off with knives and garroting wires while they were still alive, rape them and ultimately murder them in their ritualistic killings.

Lorraine's brother Mark Borowski was 14 when his sister was raped and brutally murdered by the Ripper Crew. He said he was horrified when he learned Kokoraleis is due for release on September 29.

Mark recalled the haunting memories from the time after his sister went missing to the Chicago Tribune. He remembers five months of passing out fliers in hopes of finding her, and finally, the gruesome discovery of her remains.

Lorraine had a closed coffin Catholic funeral as her remains were too decomposed for loved ones to view and say their goodbyes.

Lorraine Borowski (pictured) was brutally mutilated and raped before being murdered

Thomas Kokoraleis in a mugshot from 1982. He was convicted of the brutal slaying of Lorraine Borowski

Left to right, the Ripper Crew: Robin Gecht, Edward Spreitzer- both ineligible for parole and Andrew Kokoraleis- killed by lethal injection

Thomas Kokoraleis' older brother, Andrew Kokoraleis, was sentenced to death for his involvement in the torturous killings.

Mark says his parents attended Andrew's execution, and watched him draw his last breath.

He says his father Raymond, who died several years ago, 'never really got over her death.'

Mark told the Chicago Times: 'You really never get over something like this. Time goes on and you work your way through the memories but it's never gone. It's always there.'



Andrew Kokoraleis was the last of inmates to be executed in Illinois. He was 35 when he was killed by lethal injection in 1999. In 2011 the state abolished the death penalty.

The Ripper Crew's ringleader, Robin Gecht, 63, is the only member who wasn't convicted of murder- he never confessed. He is serving 120 years years for the rape and mutilation of a teenager working as a prostitute, according to the Tribune.

The teenage prostitute survived her ordeal and provided the crucial information to authorities to end the crew's brutal run.

Mark Borowski (pictured), Lorraine's brother, is appalled that Kokoraleis is due to be released

Left: Sandra Delaware, 18, was stabbed and strangled. Right: Linda Sutton, 26, was raped and stabbed to death, she was a mother of two

Left: Rose Beck Davis, 30 was raped, beaten with an ax and stabbed to death. Right: Shui Mak, 30 was beaten to death

Other victims' of the Ripper Crew included Rose Beck Davis, 30, who was raped, beaten with an ax and stabbed to death. And Shui Mak, 30, was beaten to death.

Sandra Delaware was just 18 when she was stabbed and strangled to death. Linda Sutton, 26, was raped and stabbed to death and left behind two children.

Finally another member of the crew, Edward Spreitzer, 56, also remains behind bars and is ineligible for parole.

'This guy should never get out of prison,' said John Smith Jr., a retired DuPage County Jail chief who took Thomas to his first jail cell. 'I was appalled when I saw he was going to get out. My opinion? They all should have gotten the death penalty.'

Thomas is eligible for release in a plea deal he made to do 70 years for pleading guilty to murdering Lorraine, however there is a loophole prosecutors are looking at that may keep him behind bars.

Thomas may fit the requirements for a civil commitment process for inmates who are deemed too sexually violent to be freed, sources tell the Tribune.

For civil commitment a person must be convicted of a sexually violent offence and must suffer from a mental disorder.

During Thomas' trial his lawyer described him as 'borderline' mentally impaired with an IQ of 75.