Gerry 'The Monk' Hutch may never face fresh charges in connection with the Regency murder of David Byrne, senior sources believe.
But other arrests following the 2016 gangland killing are imminent.
Hutch, 60, walked free from the Special Criminal Court on Monday after he was acquitted of murdering the 34-year-old Kinahan cartel lieutenant.
Now a number of senior gardai are said to be concerned that Hutch faced a murder charge only - and not firearms.