Mark Blanco, 30, died after plunging from a balcony at a flat in Whitechapel in east London.
After examining the case in detail, the Crown Prosecution Service (CPS) said there was insufficient evidence to charge any individual with either murder or manslaughter.
Blanco had been involved in a confrontation with Doherty, his minder Johnny Jeannevol and a friend, Paul Roundhill, at the party shortly before the actor’s death, investigations have shown.
All three have denied any wrongdoing and an investigation and police reports have failed to establish the circumstances that led to the actor’s death.
Jeremy Hopkins, head of the CPS London Complex Casework Unit, said none of the evidence available was capable of establishing that Blanco was thrown or pushed from the balcony or that any other individual was present when he fell.
“If any further evidence does come to light, we will, of course, review our decision in accordance with our normal practices,” he added in a statement to the media.
Blanco’s family has been waging a long campaign for an inquiry and has already vowed to issue private proceedings against Doherty.