Grievous bodily harm
The aspiring musician was stabbed to death in Hackney in May.
Alexander Lewis-Ranwell was remanded in custody.
Brendan McCarthy was accused of grievous bodily harm following the procedures.
His girlfriend suffered more than 40 injuries.
Jourdan Dougherty, 15, died from stab injuries outside a 16th birthday party.
He was arrested in hospital after severely injuring a woman.
He is charged with GBH.
Five others have already appeared in court, including victim's father.
They have been arrested on suspicion of conspiracy to commit grievous bodily harm.