THE state’s most violent inmate will remain behind bars for another five years after the Supreme Court ruled she was too dangerous to be released.

It is surprising, but the odious title of NSW’s most violent prisoner goes to a woman, Rebecca Butterfield, 41, who is known to self-harm to lure officers into her cell at Silverwater so she can attack them.

Butterfield, who has been diagnosed with several personality disorders, completed a 12 year-sentence on November 3 last year for the manslaughter of another prisoner who she stabbed 33 times in an unprovoked attack.

media_camera Silverwater Women's Correctional Centre where Rebecca Butterfield is held.

INCIDENT REPORTS 2003 – Ms Butterfield requires stitches after cutting her own throat

– Ms Butterfield requires stitches after cutting her own throat 2004 – Ms Butterfield requires more stitches, again cutting her throat

– Ms Butterfield requires more stitches, again cutting her throat 2005 – Ms Butterfield tries to hang herself, then cuts her throat

– Ms Butterfield tries to hang herself, then cuts her throat 2006 – Ms Butterfield cuts her throat and almost bleeds out

– Ms Butterfield cuts her throat and almost bleeds out 2008 – Ms Butterfield is severely burnt after setting fire to her cell

– Ms Butterfield is severely burnt after setting fire to her cell 2008 – Ms Butterfield severely bangs her head and inserts items under her scalp

– Ms Butterfield severely bangs her head and inserts items under her scalp 2009 – Ms Butterfield head-butts a wall 105 times and splits her skull open

But the NSW Government has successfully applied through the Supreme Court to keep her behind bars for a further five years under the Crimes (High Risk Offenders) Act on the grounds she is an “unacceptable risk” of reoffending.

It is the longest time period an offender can be kept in prison after they have completed their full sentence.

This week Justice Stephen Rothman published his reasons for taking the extreme step of keeping Butterfield locked up.

“The combination of disorders and psychoses suffered by the defendant and her history of criminal violence leads inexorably to the view that if unsupervised this defendant would more likely than not commit a serious violence offence,” he wrote.

Butterfield is the subject of 39 Corrective Service alerts in nine years.

The suicidal woman has cut her own throat four times, severely burnt herself when she set fire to her cell and on one occasion headbutted a wall 105 times cracking open her own skull.

Mr Rothman wrote that on occasions her attempts at self-harm seem to be a ploy to hurt others.

“There is evidence that some of the defendant’s threats of self-harm or engagement in self-harm are premeditated for the purpose of forcing officers to enter her cell and enabling her to increase her opportunities for violence against the officers,” he wrote.

Her assaults in custody include stabbing an officer in the face, throwing a cup of urine and throwing a cup of boiling water at two other officers.

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media_camera Butterfield has allegedly self-harmed in a bid to get others into her cell so she could attack them.

Butterfield’s lengthy violent history began when she was 21.

She was first convicted in 1996 of numerous counts of malicious damage, drug offences and unlawful entry.

Over the years her violent crimes escalated until November 2000 when she stabbed a neighbour five times who was trying to stop her from self-harming.

She was serving a non-parole period of three years for grievous bodily harm against the neighbour when she killed fellow prisoner Bluce Lim Ward in 2003.

Butterfield will be released on November 3, 2020.