Aaron Brady will spend the next 39 years of his life behind bars for the murder of Detective Garda Adrian Donohoe.
Brady (29) was yesterday handed the mandatory life sentence with a minimum of 40 years for the capital murder of the officer at Lordship Credit Union, Co Louth in 2013.
He was sentenced to 14 years for armed robbery, with the sentence to run concurrently.
The judge, Mr Justice Michael White, backdated the sentence to February 2018, when Brady was first taken into custody.
After going through the evidence and hearing victim impact statements, Mr Justice White said there were no mitigating circumstances for him to consider in handing down the sentence.
Anyone who saw the CCTV footage or heard the audio recording of what happened at Lordship would be "shocked to the core", he said.
The hearing was broadcast to Gda Donohoe's colleagues in Dundalk Garda Station.
The court heard, in summing up of evidence, how Brady had lied to gardaí and fled to America, even as he was already on bail for motoring offences at the time.
When he was deported from America he was convicted for criminal damage and dangerous driving from the incident when he drove a stolen car around Dundalk and crashed into a number of taxis and a garda patrol car.
It heard how he had admitted to people while in New York that he had killed a "cop", sometimes boasting and sometimes lamenting.
After the hearing Justice Minister Helen McEntee said the murder was an "attack on this State".
"I don't think anything can make up for the suffering and the loss that the family and friends of Det Garda Donohoe have felt and they are all in our thoughts today," the minister said.
"The pain that his wife Caroline, his children Niall and Amy, his siblings, his family, his wider community, that can never be erased by a sentencing or conviction".
She said Det Garda Donohoe is "a perfect example of what is good about this country" adding that he "worked tirelessly in serving his community and this State".
Last night gardaí said Brady was just one member of a criminal gang on that day.
"This investigation remains live as the other members of that gang remain to be brought before the courts; the commitment and tenacity of the investigation team based at Dundalk Garda Station to bring all suspects to justice remains steadfast."
Garda Commissioner Drew Harris said: "An Garda Síochána's resolve to bring all the participants in this crime to justice remains firm and the investigation team at Dundalk will continue to be supported by the resources of the wider organisation."
The Herald previously revealed that members of Brady's "closest inside circle" are expected to be arrested this month in relation to the failed campaign of intimidation that blighted his trial.
Earlier this week four suspects were arrested by detectives. At least four more arrests are expected of suspects in and outside our jail system in the investigation.