Campbell admitted shooting Kadeem under the orders of Hamblett-Sewell
Two men have been jailed for life for the murder of a Derby boy in a gang-related shooting.
Kadeem Blackwood, 15, was shot in the chest in the Caxton Street Recreation Ground in Derby last November in a row over "disrespect".
Callum Campbell, 19, of Derby, admitted shooting the rival teenager under the orders of Michael Hamblett-Sewell, 20, also of Derby, who had denied murder.
Hamblett-Sewell must serve at least 23 years in prison, and Campbell 21 years.
Ashley Campbell, 24, of Derby, who admitted assisting an offender, was jailed for two-and-a-half years for helping the gunman escape.
Nottingham Crown Court heard that Kadeem had met rival gang members for a pre-arranged fight at the park on 11 November.
But when he drew a kitchen knife, Callum Campbell, of Osmaston Park Road, pulled out a sawn-off shotgun and shot him.
Hamblett-Sewell, of Marlborough Road, Derby, who was described as a "general" in the A1 Crew gang, had denied murder but was convicted last month.
He ordered Campbell, a "lieutenant" in the group, to pull the trigger, the men's trial had heard.
Sentencing, Judge Justice Dobbs told them: "On November 11 last year the life of 15-year-old Kadeem Blackwood was ended prematurely and abruptly and why?
"His crime was that by his tone of voice he had dissed, that is to show disrespect, to you Mr Hamblett-Sewell.
"So far as you were concerned Callum Campbell, Blackwood was apparently going around slandering you, saying he could beat you in a fight.
"He showed a bit of cheek and his punishment was to lose his life."
She told Hamblett-Sewell: "The signs are that you have the makings of turning into a hardened criminal, a slave to misplaced gang culture.
"It is said that there is another side to you," she said. "This court did not see that side during the course of the trial."