Paul Williams: 'Quirke joins ranks of Ireland's most cold-blooded and calculating killers'
Pat Quirke, Prisoner 107243, has become a member of a select group within the ranks of Ireland's most notorious murderers; people whose shocking crimes will be enshrined in the collective public memory and the annals of the Irish criminal justice system.
The 50-year-old farmer - convicted of murdering his love rival after the longest murder trial on record - joins a small gang of other prisoners who became household names for the worst of reasons. Names such as Joe O'Reilly, Graham Dwyer and Brian Kearney.
Like the others, Quirke is responsible for a particularly callous and cold-blooded murder that captivated the public during long and hard-fought courtroom battles to prove their guilt.
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He shares many common traits with O'Reilly, Dwyer and Kearney including the fact none of them had ever been involved in crime before and were seen as respectable middle-class, law-abiding citizens.
All of them displayed narcissistic tendencies - as evidenced by a common belief that each one of them had carefully planned and executed the perfect murder.
In each case, the killer demonstrated the attitude that he was cleverer than the force and could easily outwit it, which in turn led to some of the best examples of detective work in the history of An Garda Síochána.
One insight gleaned from Quirke's computer, which was not allowed into evidence, was an interest in the notorious case of wife killer O'Reilly.
O'Reilly bludgeoned his wife and mother of his two young children Rachel to death when he made a mid-morning visit to the couple's home in the Naul, north Dublin, in October 2004.
He had devised an elaborate plan to murder his wife and make it look like an intruder had attacked her. He built a false alibi that he was busy working in Dublin at the time of the crime.
O'Reilly even appeared on 'The Late Late Show' to appeal for information on the murder alongside Rachel's mother, who by then suspected he was the killer.
He was eventually convicted after a long and dramatic Garda investigation blew his alibi apart by tracking his movements through his mobile phone.
It is reasonable to assume that by searching the online blog "Why Joe O'Reilly thought he had committed the perfect murder", Quirke was trying to learn from O'Reilly's mistakes.
Another individual Quirke is likely to encounter is Brian Kearney, whose cold-blooded murder of his wife Siobhán in February 2006 earned him his place in the pantheon of notorious killers.
His motive for murder was that she intended leaving him causing him financial problems.
Kearney also put on a false face and attempted to brave it out, but came unstuck after another intensive Garda investigation.
Graham Dwyer is a household name who will always be synonymous with one of the most grotesque and depraved murders ever to come before the courts.
Elaine O'Hara, a vulnerable woman with a history of mental illness, had been groomed by Dwyer over a number of years during which they were involved in a BDSM relationship.
The Foxrock architect hid from the world his perverse fascination for piquerism, which involves inflicting pain on a victim using knives and drawing blood for the purpose of sexual gratification.
Dwyer probably reckoned that he had learned from the mistakes of O'Reilly and Kearney when he decided to finally fulfil his ultimate fantasy and murder Elaine O'Hara in August 2012.
Ireland's latest inductee to this notorious lifers' club will have plenty to discuss as they while away the slow passage of prison time.