The teenager who stabbed innocent Lorcan O'Reilly to death has been taken under the Kinahan cartel's wing behind bars - after being moved to Mountjoy Prison.
The Herald has learned that the young killer, who is close to mobster 'Fat' Freddie Thompson, was moved to the Dublin jail from Oberstown youth detention centre on Wednesday.
He turned 18 last week and as a result was transferred to the adult prison - but he cannot be identified for legal reasons.
The thug was just 14 when he stabbed Lorcan (21) to death in the south inner city. The innocent victim was killed after stopping a fight.
It can be revealed that Thompson demanded to have his young associate moved to join him in Portlaoise, but this was rejected, leaving 'Fat' Freddie "furious".
He is now housed with some of the Kinahan cartel's most senior associates who are either locked up for serious offences or awaiting trial for feud-related activity.
They include Liam Brannigan (38), a cousin of Thompson, who is facing charges before the Special Criminal Court.
Thompson himself is serving a life sentence for the feud murder of David 'Daithi' Douglas, who was gunned down in his wife's store on Bridgefoot Street.
Detectives believe the killing was part of the Hutch/Kinahan feud, which has so far claimed 18 lives both in Ireland and abroad.
Also in Mountjoy is Glen Holland (35), who was jailed for six-and-a-half years after spending several years on the run from gardai.
He pleaded guilty to having two loaded handguns as well as almost €70,000 of cocaine when they were recovered in September 2010.
Holland, who is one of the most senior cartel associates behind bars, was arrested but never charged with the murder of Eamon 'The Don' Dunne.
Several other cartel "foot soldiers" are being held on the same landing, including a young Dublin man suspected of a feud murder and a Crumlin man previously convicted of possessing pipe bombs.
Lorcan's killer began his four- and-a-half-year manslaughter sentence in Oberstown, but is expected to serve the remainder of his term in Mountjoy.
After killing Lorcan, he fled the country with his mentor Thompson but eventually returned and presented himself to gardai.
He was initially charged with murder, but later pleaded guilty to manslaughter.
In February last year, the teenager was given a six-year jail term with the final 18 months suspended.
It has also emerged that Thompson demanded that his young prodigy be transferred to join him in Portlaoise Prison.
However, the move was not granted by prison officials, with Thompson said to be "furious" that his associate will not be moved to the high-security prison.
The teenager had been "progressing" in Oberstown, where he was held for several years, before turning 18 on November 5.
This resulted in him being moved to Mountjoy this week, which has led gardai to fear that he will fall under the influence of the Kinahan cartel's senior Dublin members.
Sources said that move had left gardai "seriously concerned" because the teenager was progressing in Oberstown detention centre where he was undergoing courses.
"He is now mixed in with some of the country's most dangerous mobsters, and it is very likely that he will become involved with the cartel," one source said.
However, gardai believe that the killer is still "better off" in Mountjoy than with his mentor Thompson in Portlaoise.
The Herald previously revealed how Thompson was being held on the same landing as crazed killer Warren Dumbrell, who is considered one of the most disruptive inmates in the Irish prison system.