[3] In 1997 while acting as a Garda witness, Bowden named Holland in a Dublin court as the man he supplied the .357 Magnum gun to, and hence suspected of shooting Guerin.
Initially arrested for involvement in Guerin's murder, after an inspection of his premises and assets he was eventually charged for possession and distribution of 10 kilograms (22 lb) of cannabis.
Whilst in Portlaoise Prison, he befriended Colm Murphy, the first person to be convicted in connection with the Omagh bombing, but was resisted by his fellow members of the Real IRA from entering their area of the jail.
[5] Released from Portlaoise in April 2006,[6] he flew to Rome, Italy where his lawyer Giovanni Di Stefano had arranged a series of psychological tests and press interviews, in which Holland strongly denied the murder of Guerin.
In May 2007, a year after being released from jail in Ireland, Holland was arrested by the Metropolitan Police in London, who were investigating a honey trap plot to kidnap a businessman for a £10 million ransom.
These were handed by his family to the Irish Sunday Mirror, which subsequently published a series of articles in which Holland claimed that: yes, he was a bank robber by the early 1970s; he had set up a money-laundering network across Europe to hide his fortune from the CAB; he again denied the murder of Guerin.