A man who was detained in connection with the fatal stabbing of another man in Dublin city centre has been returned to Store Street Garda Station for questioning following hospital treatment.

Peter Donnelly from Kilkenny died after he was stabbed several times on O'Connell Street.

A 28-year-old man was arrested a short time later on nearby Marlborough Street, but his detention was suspended and he was brought to hospital for treatment for injuries.

His detention period has now been reactivated and he can be questioned at Store Street for a total of 24 hours.

Tributes have been paid on social media to Mr Donnelly, who was with a friend when a row broke out and he was stabbed.

The 39-year-old was known to abuse drugs and had around 15 previous convictions for minor assaults, violent disorder, breaches of the peace and road traffic offences.

It is believed he went to England where he rehabilitated himself and worked for a time as an outreach worker.

However, he returned to Ireland and in recent months fell back into drug abuse and minor crime.

He had no identification on him when he died and it took gardaí some time to identify him and inform his family of his death.

Detectives are satisfied that Mr Donnelly and the man in custody knew each other, but are still trying to establish a motive for the murder.