The Colindale victim was treated by land and air ambulance crews before being taken to hospital in central London.
Another friend paid tribute to the young father, saying: "He was a good guy".
Police are investigating another fatal stabbing in the capital after the death of a man in east London.
A 34-year-old woman was arrested on suspicion of murder at the scene of the Colindale attack.
Dihan was wanted in several cases, including murder, snatching and extortion, lodged with Kotwali Police Station, the OC said.
"A male aged in his 20s has been arrested on suspicion of murder".
Post mortem examinations on the bodies of both the victims are expected in "due course", the Met said.
Dihan was the prime accused in Robin murder case filed with Kotwali Police Station past year, police said.
The victim, believed to be aged 18, was found injured in Chestnut Avenue, Forest Gate, on Monday night.
London's murder rate has risen 40 per cent in only three years, and was higher than the homicide rate in NY for the first time in history in February of this year.