Chief Superintendent Nigel Grimshaw called the murder ‘a tragedy for Bangor’.
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The man shot dead in Bangor, County Down, on Friday was 56-year-old Duncan Morrison.
The shooting happened at Hazelbrook Avenue off the Clandeboye Road at about 1220 BST.
Another man in his 40s was also shot and is in a stable condition in hospital.
Police investigating Mr Morrison’s death are understood to be linking the attack to the drugs trade.
One man has been arrested.
It is understood the two men did not live in the house where they were shot.
The PSNI said that both victims were known to police.
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