Kadeem Blackwood was shot dead in November
A 15-year-old was shot dead for "disrespecting" the mother of a rival gang leader, a court has heard.
Kadeem Blackwood was killed at Derbyshire's Caxton Street recreation ground on 11 November 2008.
Nottingham Crown Court was told gang "general" Michael Hamblett-Sewell, 20, ordered fellow member Callum Campbell, 19, to shoot Kadeem.
Campbell, of Osmaston Park Road, Derby, admitted murder. Mr Hamblett-Sewell, of Marlborough Road, denies murder.
The court was told Mr Hamblett-Sewell, a "general" of the A1 Crew, was due to fight Kadeem, a member of a rival gang, that evening.
Peter Joyce QC, prosecuting, said: "The grudge was between this defendant and Kadeem Blackwood.
"Not only were they members of rival gangs but there will be evidence to suggest the dead boy, in common parlance, had 'dissed' or shown disrespect to Hamblett-Sewell's mother and for that there was to be a fight."
The trial continues.