Detectives investigating the murder of John Boreland in north Belfast on Sunday night have arrested a 42-year-old man.
The man was detained in the north of the city on Monday evening.
Meanwhile, police have stepped up patrols around the area where Boreland, a prominent UDA member, was shot dead amid fears of retaliation attacks.
Detectives believe that the 46-year-old father-of-three, who was killed outside his home, was the victim of loyalist in-fighting.
Forensic officers were on Monday seen combing the area for clues.