The Detective Garda was murdered in 2013.
The investigation into the murder of Detective Garda Adrian Donohoe is revealed in a new book by a former detective.
Mullingar's Pat Marry was the Detective Inspector involved in the case in 2013.
'Murder at Lordship' recounts the Gardaí's collaboration with the FBI, the NYPD and Homeland Security in uncovering the details of the murder.
The Private Detective says he couldn't let his colleague's family down:
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