Mark Gourley's body has never been found
A 50-year-old man who was arrested in connection with the murder of County Antrim man Mark Gourley has been released from custody unconditionally.
Mark Gourley (36) was reported missing on 7th March 2009 from Glengormley.
He was described as a vulnerable individual and was on medication at the time of his disappearance.
Police launched a murder investigation in 2013.
His body has never been found.
A man was detained in Carrickfergus this morning and taken to a Belfast police station for questioning. He has since been released unconditionally.
PSNI are continuing to appeal to anybody with information about Mark's disappearance to contact them.