A 16-year-old boy has been charged with murder after a young man was stabbed to death outside Parsons Green Tube station.
Omid Saidy, 20, was killed outside the west London station on Monday evening.
He was heard screaming for help as he lay injured but died at the scene in front of distraught family members who had raced to be by his side.
Scotland Yard said Mr Saidy, from Fulham, confronted a drug dealer and another man and asked them to move on before he was attacked.
The 16-year-old also faces a charge of possession of a bladed article over the fatal attack.
He has been remanded in custody and is due to appear at Wimbledon Magistrates' Court on Thursday.
An 18-year-old man, a friend of the victim who arrived on a moped, was also stabbed in the attack and is still in hospital with serious injuries, police said. He has been arrested on suspicion of affray.
The teenage suspect was also injured during the attack and was arrested after being released from hospital.
A second suspect, described as a black male dressed in dark clothing, fled down Harbled Road in the direction of Fulham Court.
Officers have renewed their appeal for any witnesses or anyone with footage of the incident to come forward.
Detective Chief Inspector Noel McHugh, who is leading the investigation, said: "We continue to piece together a picture of how the sequence of events leading to and immediately following the murder took place.
"It is imperative that we speak to anyone who was in the area of Parsons Green station between 7pm and 8pm who may have witnessed the murder or the actions of the suspects immediately following the incident.
"In addition, I am keen to identify the black male who fled Parsons Green Lane immediately following the murder and am appealing for footage that members of the public may have recorded as events in the area took place.
"Although we have charged a male with Omid's murder, this is still a live and ongoing investigation.
"A young man has tragically lost his life for simply asking a drug dealer to move on.
"I urge anyone who can assist our investigation to come forward without delay."
Anyone with information can call 0208 785 8099 or Crimestoppers anonymously on 0800 555 111.
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