Two prisoners who murdered a fellow inmate in his cell five days before his release have been jailed for life.
Wayne Reid, 44, of Birmingham, was stabbed at Rye Hill Prison, near Rugby, Northampton Crown Court heard.
Inmates Ibrahim Musone, of Cricklewood, north London, and Bisharat Chaudry, of Slough, Berks, will serve at least 15 years and 14 years respectively.
Deedar Syed, 26, of Peterborough, Cambs, was jailed for 30 months for disposing of a blood-stained jacket.
Threat to status
The court heard that Musone, already serving five years for what Judge Charles Wide said was a "particularly vicious" aggravated burglary, plotted revenge against Reid for a perceived threat to his status in the privately-run jail.
Father-of-three Reid, of Balsall Heath, was involved in a fight with another inmate and, when the bigger Musone stepped in, he threw Musone's carton of milk to the floor.
Judge Wide told Musone: "The pretext for killing Reid was nothing - just to do with your status in prison.
"Arrogant and vain as you are, devious and manipulative as you are, you decided that you would kill him."
Chaudry had supplied the murder weapon - a butterfly knife - and then hidden it in a toilet pipe in his cell after the murder.
The judge said he must have been aware that the knife would be used to cause massive injury or even death to Mr Reid.
He was sentenced to another five years, to run concurrently, for disposing of the murder weapon.
The court heard Reid was stabbed twice through the heart.
Syed, who faced the lesser offence of assisting an offender, was told he must have been aware Reid was going to be attacked but not that a knife was involved.
Speaking after the hearing, Reid's family described him as a "model prisoner" who had recently passed a degree course taken while inside and had already been offered a job as a drugs rehabilitation worker on his release.