Three people who were arrested by detectives investigating the murder of a man in north Belfast on Saturday have been released without charge.
Robbie Lawlor, 36, who was from Dublin, was shot outside a house in Etna Drive in Ardoyne.
He had been a suspect in the abduction and murder of Drogheda teenager Keane Mulready-Woods in January.
It is believed Mr Lawlor was a leading figure in a feuding criminal gang.
Two men aged 30 and 33 and a 17-year-old boy who were being questioned about his murder have been released unconditionally.
On Monday, a 27-year-old man was also released unconditionally.
The PSNI believes a single gunman was involved.
On Sunday, properties in west Belfast and Crumlin were searched by police, but officers said they had not yet recovered the murder weapon.