A man was due to appear in court today charged in connection with the murder of a man blasted with a shotgun on a rural country road.
The 44-year-old has been charged with assisting offenders.
Philip Strickland (36) was found slumped in a car near Comber, Co Down, on Wednesday night. He had been shot several times and was declared dead in hospital a short time later.
Last night police said they had arrested a 54-year-old man from the Comber area who was assisting with their inquiries.
Two men were also released pending a report to the Public Prosecution Service, and two womenaged 19 and 21 were released unconditionally.
Police are investigating whether the murder was linked to a criminal feud. Mr Strickland, who was from Comber but lived in east Belfast, was known to the police.
He was found in the front of his blue Citroen Saxo car on the quiet Ballydrain Road near Comber.
Members of the public, who made the discovery at around 9pm, had attempted to resuscitate Mr Strickland.
His killers had botched an attempt to set the car alight before fleeing from the scene.