Mr Nicholls died in hospital after the incident
The mother of a teenager, who died following a suspected gang fight, has made a new appeal for information about his killing.
Isschan Nicholls, 18, from Poplar, east London, was stabbed during a brawl involving up to 15 youths in Bow.
Jennifer Williams said those responsible for the "vicious attack" on her son in January must come forward.
Ten people aged between 15 and 42 were arrested by police shortly after the incident but later released on bail.
Isschan died in hospital two days after being stabbed on 13 January.
His mother said he was "loved by so many people" and passionate about his music, which was his main hobby while at college.
She added: "Our son has been put to rest, but the fact remains there are people harbouring others who have carried out this evil, vicious attack.
"There are no excuses; reasoning or justification for this kind of violence and those involved must come forward to take responsibility for their actions and for the lives they have ruined.
"We have been robbed of someone precious to us and we will be grieving his loss for the remainder of our days.
"The emotional and mental pain that we go through daily is unexplainable, it is a surreal experience for us".
The police are still unclear about the motives surrounding Isschan's death.
Det Ch Insp Dave Manning, of the Homicide and Serious Crime Command, said: "We know that shortly before the fight, Isschan and four friends had been travelling in a blue Rover which parked in Parnell Road.
"The vehicle was parked close to a Ford Fiesta which entered the road moments earlier containing four males.
Anyone with information about the murder should contact the Metropolitan Police.