The number of teenagers to die violent deaths in London this year has reached 27, exceeding the number killed in the city during 2007.
Craig Marshall, 19, from Hanbury Road, Acton, died in hospital on Friday morning after turning up at a west London police station with stab wounds.
He was the 27th teenager to die violently so far in 2008, exceeding the 26 violent teenage deaths last year.
Two men have been arrested in connection with Mr Marshall's death.
His mother, Sharon Marshall, said she had lost her "baby boy".
Mr Marshall arrived injured at the front counter of Acton police station on Thursday night.
He was taken to hospital but died a few hours later.
Police said he was thought to have been attacked outside Rufford Tower in Lexden Road.
"You hear about these kids dying but nothing is ever done"
"He was a good kid, he wasn't mixed up in any gangs," Mrs Marshall said.
"My mind is a mess. I can't cope with this right now. You hear about these kids dying but nothing is ever done."
Murder squad detectives are investigating the attack, which happened at about 2300 BST.
Police and forensic officers have been searching the area around Rufford Tower.
A Scotland Yard spokesman said officers were investigating the possibility that the death was drugs related.
Nineteen of the 27 teenagers killed violently in London this year have been victims of knife crime.
Earlier this week London Mayor Boris Johnson victims' families at a London conference aimed at "shaping" his strategy on youth violence.
Mr Johnson described the reduction of youth violence as "a mammoth task that will take the full commitment of many of us working tirelessly together".
More than 2,000 people marched through London last weekend in protest at the use of knives by young people.
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