A third suspect has been arrested by detectives investigating the murder of Danny McKay.
The 36-year-old was gunned down as he sat in the living room of his home at Longlands Road in Newtownabbey, Co Antrim on Thursday night.
The PSNI said a 28-year-old man is being questioned over the shooting.
Two other men, aged 41 and 50, have already been arrested and are also being detained in Antrim's serious crime suite.
Mr McKay was shot several times, at least once in the face, by a gunman who fired from a hijacked car which was later found burned out in the west of the city.
Police, who have called the shooting a brutal and ruthless attack, are investigating a possible drugs link.
The father-of-one was known to police but was not considered to be a senior criminal.
Investigators have made a fresh appeal for information on a silver Volkswagen Bora, registration number KLZ 9787, which was in the Belfast or Newtownabbey areas on Thursday.
A PSNI spokesman said: "Detectives are also keen to speak with anyone who may have seen a dark-coloured saloon car being driven in a suspicious manner in the Longlands area of Newtownabbey in the days leading up to Mr McKay's murder."