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''The person of interest for officers is now described as aged between 20-40 years at the time of the murder.
The man is described as 5ft 7ins and will now be aged between his mid 30s to 60s.
Police have also now revealed he was wearing a baseball cap and jacket at the time.
Previous descriptions had said the man who shot Mr Wilson could have been a full decade older.
The new description has been issued following a review of information by the murder squad investigating the death of Alistair Wilson.''