Surrey Police said the matter has now been formally passed to the coroner and an inquest will be held after finding no evidence of foul play. This was despite two post-mortem examinations carried out in November failing to establish Alexander Perepilichnyy's cause of death.
Toxicology samples were also taken from both post mortems but the results have not been released.
More top news
The family of Oliver Dearlove urged people to "think again" before using their fists, as the man who killed him began a six-year jail term.
London Fire Brigade took Southwark Council to court on four charges in relation to safety breaches at Lakanal House in Camberwell.
Oliver Dearlove died 24 hours after receiving the fatal blow outside Morden's wine bar in Blackheath last summer.