Alleged Sydney stabbing perpetrator Mert Ney facing new child abuse charge

The man who allegedly killed a sex worker before running through the Sydney CBD on a stabbing rampage earlier this year has been charged with an additional child abuse offence.

Mert Ney was detained during a citizen's arrest near Wynyard train station in August, after he ran through the streets shouting religious slogans and brandishing a large bloodied butcher's knife.

The 20-year-old was chased through the city by members of the public, who then restrained him with chairs and a milk crate until police arrived.

Moments before the chase and his arrest he allegedly emerged from an apartment building after fatally stabbing 24-year-old sex worker Michaela Dunn. Another woman, Linda Bo, 41, also suffered stab wounds.

Mr Ney was previously charged with murder, attempted murder, wounding a person with intent to cause grievous bodily harm, intentionally choking a person with recklessness and common assault.

On Tuesday he was served with a number of new offences including possessing child abuse material on a USB during the attack.

The 20-year-old allegedly possessed three images consistent with child abuse material on the digital device in his pocket at the time of the stabbing rampage.

He is also accused of possessing cannabis and being armed with a knife with intent to cause a serious offence.

The 21-year-old remained quiet as he appeared via video link before Central Local Court on Tuesday, when he was remanded in custody.

with AAP