Two men have been found guilty of murdering a man they stabbed to death when he tried to buy heroin from them.
Adrian Locke, from Droitwich Spa, was stabbed several times and found dead outside a flat in Worcester in January.
Micah Golding, 22, of Crossfarm Road, Harborne, and Rikko Marks, 20, of no fixed address, were both jailed for life. Golding was ordered to serve at least 20 years and Marks at least 16.
Both had denied murder at Worcester Crown Court.
Golding and Marks pleaded guilty to conspiring to supply heroin and crack cocaine in Worcester between 1 December 2012 and 3 January 2013.
Golding was given four years and Marks four and half years, with the sentences to run concurrent to their murder terms.
During the trial, the court heard 39-year-old Mr Locke was attempting to buy drugs from Golding at an address in the Tolladine area of the city.
A struggle had broken out between the three men when Mr Locke was told there was no heroin and he was fatally stabbed, the court was told.
Det Insp Stuart Murphy said that the knife used in the murder was recovered at the scene and both Golding and Marks's DNA was found on it.
He said the pair ran "a highly organised drugs operation" from Teme Road, catching a train in from Birmingham every morning and then returning after they had finished their dealing.
Although they were only known by their nicknames, 'P and D', detectives were able to trace them with help from people in the Tolladine area and from other drug users.
"A number of [drug users] were very brave and made statements, and came to give evidence at the trial," Mr Murphy said.
Adrian Locke's mother Lillian described him as a hardworking and considerate son, in a statement released on behalf of the family.
She said he loved children, in particular his 18-year-old son Calum and his nephews and nieces.
"Adie was no angel but he would go out of his way to help anybody and was always ready to have a laugh and joke.
"Although no sentence will ever bring Adie back we can take some comfort in the knowledge that the person/persons who did this will be spending a very long time in prison," she said.