Charles Bronson, the man dubbed "Britain's most notorious inmate", could be released from solitary confinement this week.
Bronson will attend his first parole hearing since being handed an indeterminate prison sentence for taking a teacher hostage in Hull Prison in 1999.
The convict may be released from the maximum security unit he is held in at Wakefield Prison.
His solicitor Giovanni Di Stefano said the parole board could allow Bronson to walk out of prison a free man tomorrow.
However, it is more likely he will be released from isolation so he can mix with other prisoners.
From his office in Iraq, where he is currently fighting to overturn the death sentence Saddam Hussein's former right hand man "Chemical Ali" faces, Mr Di Stefano said: "Charles is currently a category AA prisoner and is in solitary confinement.
"This could change, however, if the parole board think it appropriate. Ultimately, they have the power to release him as a free man in one day's time."
In February 1999, Bronson, who was serving a jail sentence in Hull Prison for armed robbery, burst into a classroom where Phil Danielson, then 37, was teaching.
The convict tied a skipping rope around Mr Danielson's neck and tugged him around at knifepoint, holding him hostage for 44 hours and leaving the teacher fearing for his life.
Bronson was sentenced in 2000 to a discretionary life sentence with a three-year tariff.