Mert Ney: Man slashes prison guard after being jailed for killing sex worker Michaela Dunn

• Mert Ney slashed prison guard on Friday
• He is serving time for murder of Michaela Dunn in 2019
• READ MORE: Woman accused of deliberately trying to kill a man and four children in car crash

A notorious murderer who was jailed for decades for viciously stabbing a sex worker to death during a bloody rampage, has attacked a prison guard with a razor blade.

Mert Ney shocked Sydney in August, 2019 when he murdered Michaela Dunn, 24, and ran through the streets brandishing a knife, stabbing another woman before he was subdued by brave Good Samaritans.

He was jailed for more than 40 years, with Supreme Court Justice Peter Johnson describing his actions as a 'cruel, brutal and terrifying attack made for no reason'.

Ney is being housed at the state's most secure prison, Goulburn Supermax.

It is understood Ney slashed a corrections officer across the chest during an incident on Friday at about 10am.

The officer was taken to hospital in a stable condition.

Ney was sentenced to 44 years in jail, with a non-parole period of 33 years over the murder of Ms Dunn.

His earliest release was reduced by three years after he successfully appealed to the Court of Criminal Appeal in October last year.

In October 2021, Ney was convicted of assaulting a corrections officer while in jail, for which he was sentenced to 15 months jail.

He was also convicted and sentenced to 12 months for setting his cell on fire.

In February last year, Ney was sentenced to 15 months jail for throwing boiling water on a fellow inmate.

At the time of Ms Dunn's death, Ney had booked a $250 sexual service with the young woman who worked out of a Clarence St unit.

He then viciously stabbed her in the face, neck, chest and arms before going on a terrifying rampage through the streets brandishing another knife and with a balaclava over his head.

A group of courageous citizens managed to subdue him with a chair and a milk crate before he was arrested by police.