A 25-year-old man arrested in connection with the murder of Daniel McKay has been released without charge.
He had been questioned at the PSNI serious crime suite in Antrim.
A police spokeswoman confirmed he had been released unconditionally.
Mr McKay, a 36-year-old father of one, was shot dead at his home in the nationalist Longlands estate in Newtownabbey, Co Antrim, on October 25.
The detective leading the murder hunt said they were investigating a possible drug link and could not rule out the involvement of dissident republican paramilitary groups.
To date 10 people have been arrested over the shooting but no one has been charged.