They said Mr Mackin has a child and lived with his mother close to where he was shot.
BBC: Fresh appeal over murder of Christopher Mackin in Belfast
2.
Mr Mackin was conscious when the emergency services arrived, but died an hour later in the Royal Victoria Hospital.
BBC: Fresh appeal over murder of Christopher Mackin in Belfast
3.
Christopher Mackin, a 31-year-old known to police, is thought to have been shot up to four times during the incident at College Square North on Thursday night.
BBC: Fresh appeal over murder of Christopher Mackin in Belfast