Mark Duggan was lawfully killed when he was shot dead by a police marksman in Tottenham two years ago.
The 29-year-old, whose death sparked protests that exploded into riots and looting across the country, was shot when police stopped the taxi in which he was travelling in, in August 2011.
He was being followed by officers who believed he planned to pick up a gun from another man, Kevin Hutchinson-Foster, and then move on to Broadwater Farm.
Today jurors at the Royal Courts of Justice concluded that he had been lawfully killed by police.
They decided that he did have a gun but it was not in his hand when he was shot.
There were very emotional outbursts at the court when the conclusion was given, with Mr Duggan's brother shouting after the jurors as they left court, saying "***k them".
Other supporters shouted "murderers".
The jurors reached the lawful killing conclusion by a majority of eight to two. The jury concluded that Mr Duggan had a gun in the taxi with him before it was stopped, and by a majority of nine to one that it was more likely than not that he had thrown it onto a grassy area near the scene as soon as the car was stopped.
Eight jurors said that they were sure that he did not have a gun in his hand when he was shot.
Outbursts continued in the corridors of the court complex after the verdict, as supporters repeatedly shouted "murderers" and claimed police had got away with murder. Some smashed a door and security staff were called to contain the situation.
Outside the High Court, the family's solicitor Marcia Willis Stewart said:
On August 4, 2011 an unarmed man was shot down in Tottenham. Today we have had what we can only call a perverse judgment.
The jury found that he had no gun in his hand and yet he was gunned down. For us that's an unlawful killing.
The family are in a state of shock and we would ask that you respect their shock.
They can't believe that this has been the outcome. No gun in his hand and yet he was killed - murdered as they have said, no gun in his hand.
Mr Duggan's aunt Carole Duggan added:
For as long as it takes, God give my family strength. The majority of the people in this country know that Mark was executed.
We are going to fight until we have no breath left in our body for Mark and his children.