A 41-year-old man has been arrested under the Terrorism Act in connection with the shooting dead of Raymond Johnston on February 13.
The man was arrested in Poleglass in west Belfast.
Raymond Johnston (28) was gunned down in the home he shared with his partner and her daughter in Glenbawn Avenue in Poleglass.
In June police said he was shot by dissident republican group Arm na Poblachta.
A previous police appeal:
