EXCLUSIVE

The man being interviewed for the murder of Doncaster schoolgirl Masa Vukotic had been charged with threatening to kill two prison officers late last year, and was aggrieved at his treatment on a previous stint in jail.

Sean Price, who presented himself to Sunshine police station on Thursday over the murder in a Doncaster park, served a 10-month stint in Port Phillip prison in 2014 for assault, recklessly causing injury and criminal damage.

On September 18 and 19 of last year, he found himself inside the isolation unit for two days for a prison assault.

While in the isolation block, he threatened, over the prison intercom, to go on a "homicidal rampage" and kill police and children if he was not let out.

"I was saying some pretty vile and disgusting stuff with respect to using knives on people's orifices, threatening to hurt children," Mr Price said in a videotaped police interview at Wyndham North police station in October.

"I was buzzing continually every two seconds saying, call the police, telling them I was about to kill children."

Mr Price said he was acting that way to try to get police attention to his plight: he said he was starved of food and water for the best part of two days, and subjected to a radio played over the intercom day and night.

Mr Price approached The Age  on March 10 to complain about his treatment inside prison, and provided a recording in which a female prison officer is heard saying: "How do you think you'll go pressing that intercom if we come down and break all your fingers? ... If you've got a pointy elbow you can use that, but I don't fancy your chances".

Mr Price said he was given the recording in response to a Freedom of Information request.

Mr Price is also heard to say: "I would like to speak to the police please. Can you get the police in? ... Is this legal?"

The alleged threats to kill, which later resulted in charges, were made against two male prison officers, whom The Age has decided not to name. At this stage there is no suggestion that either is related to Ms Vukotic.

Mr Price told this reporter he made the threats because he hoped the police would come in response and provide him with food and water.

"I also flooded the cell; I pissed in the cell. I was like an animal," he said.

"I flooded the cell, but it's their duty of care. They didn't give me a glass of water ... the way they act is illegal."

In a hand-written letter to The Age, Mr Price also alleged that the treatment of prisoners in Victoria was prompting the popularity of Islam.

In 2004, Mr Price turned himself in to police and then pleaded guilty to 22 charges of raping, indecently assaulting and threatening to kill young women in the eastern suburbs of Melbourne.

He attacked six women and a 13 year old girl in daylight hours in suburbs incuding Kew, Camberwell and Balwyn between February 2002 and June 2003.

The court heard at the time that he sexually assaulted a mother of two in her home, attacked a 13-year-old schoolgirl and raped a 21-year-old woman on a footpath.

He also confessed that he had committed similar crimes in NSW, but he was not charged with them.

The court was told in 2004 that Price, who was abused as a child, suffered from schizophrenia and psychosis. He was sentenced to a maximum of eight years and two months in hospital detention, with five years and five months to be served, and ordered to be registered as a sexual offender. He served his time at the Thomas Embling Psychiatric Hospital.

In June, 2013, he was charged with multiple counts of assault, criminal damage and intent to damage and destroy property and was sentenced to three years with a non-parole period of two years. He says he was released after 10 months.

In October, 2014, he was charged with threatening to kill two prison officers, related to threats he made while in prison.