19 year old Aminur Khan, of Robin Hood Gardens, Poplar appeared in court today accused of stabbing 16-year-old Ajmol Alom to death on Monday night.
Ajmol, who has been described as a star pupil, was wounded in the thigh during the incident in Spey Street, Poplar.
Khan is also charged with the attempted murder of Ajmol's friend Azime Rob, also 16, who was stabbed through the cheek.
Both were taken to hospital, where Ajmol died.
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Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.