Killer went on rampage as Lillis was freed
One of Ireland's most violent inmates was involved in a terrifying incident which lasted for up to 30 minutes before three jail riot teams eventually subdued him.
The incident, involving convicted murderer Jeffrey Dumbrell (35), happened in a secure unit of Wheatfield Prison just minutes after the high-profile release of wife-killer Eamonn Lillis from the same jail on Saturday morning.
Prison insiders have revealed that Dumbrell requested to talk to an officer, but when the staff member entered the isolation area where the murderer is detained, he threw a mug at him.
"He was going absolutely berserk, breaking brushes and generally smashing the place up," said a jail insider.
The incident unfolded for thirty minutes as attempts to negotiate with the violent thug failed.
Eventually three riot teams, who had shields and were wearing stab vests and helmets, entered the area that Dumbrell was in and "subdued" him.
The operation took 15 officers, who were part of five different control and restraint teams.
Dumbrell was brought to an even more secure isolation unit and will face disciplinary measures for his behaviour.
The prison officer was treated for minor cuts.
Inchicore brute Jeffrey as well as his older brother Warren Dumbrell (41) are serving life sentences for the murder of Christopher Cawley (33) on October 29, 2006.
The brothers' trial heard that Mr Cawley was fatally stabbed on the stairway of the flat complex where he lived at Tyrone Place, Inchicore.
Warren attacked him with a hurley and Jeffrey stabbed him six times.
He suffered three stab wounds to the back, one to the left hip and one to the back of each thigh.
The fatal blow was a seven-inch stab wound to the left thigh which severed an artery. He bled to death, despite the efforts of neighbours and the emergency services.
Mr Cawley's wife Janette, son, and eldest daughter saw the attack. One of the Dumbrells said to the dead man's daughter as he walked away, "Your daddy's gone now", the court also heard.
Jeffrey, who admitted stabbing Mr Cawley, had eight previous convictions resulting in jail sentences before he was convicted of murder.