Monsegur was due before Judge Loretta Preska in New York on Thursday but he has once again had his sentencing postponed with the new date for the sentencing set at 27 May at 11am. His sentecning was last adjourned on 8 May.
Monsegur will face punishment for crimes associated with the 50 Days of Lulz campaign he and his fellow hackers carried out which saw them attack companiess such as Sony and EA as well as law enforcement agencies including the CIA and SOCA.
The former Anonymous hacker has already pleaded guilty to 12 criminal charges, including multiple counts of conspiracy to engage in computer hacking, computer hacking in furtherance of fraud, conspiracy to commit access device fraud, conspiracy to commit bank fraud and aggravated identity theft.
Following his arrest on 8 June 2011, Monsegur has been working with the US authorities. Initially he worked undercover to help identify the other members of LulzSec, eventually leading to the arrest of four members, including three based in the UK.
He also helped trap Jeremy Hammond who is currently serving a 10 year jail sentence for his part in an attack on Stratfor, a global intelligence gathering company.
Since it was revealed that Monsegur was an FBI informant in March 2012, it is unclear what Sabu has been helping the FBI with.
Some suggested Sabu was involved in helping the FBI track down and arrest Ross Ulbricht, the man charged with running the underground drugs marketplace Silk Road under the name Dread Pirate Roberts.
He has also been implicated in helping the FBI attack foreign governments including Brazil, Iran and Syria.