A 31-year-old man has been arrested in Essex, England, in connection with the murder of Gareth Hutch.
Mr Hutch was killed outside his home in Dublin on 24 May last year.
Today's arrest was made in the Romford area by the London Metropolitan Police, working with the National Crime Agency and the gardaí.
Yesterday, a 39-year-old woman was charged with the murder.
Another man has previously been charged.
