In November, the prosecutor’s office said toxicology tests revealed traces of alcohol, cocaine and a prescription antidepressant in Payne’s body.
A post-mortem examination determined his cause of death as “multiple trauma” and “internal and external haemorrhage”, as a result of the fall from the hotel balcony.
According to the prosecutor’s office, medical reports also suggested Payne may have fallen in a state of semi or total unconsciousness.
The prosecutor’s office said this ruled out the possibility of a conscious or voluntary act by Payne, and they had concluded the singer did not know what he was doing nor have any comprehension of his actions.
Payne became one of the most recognisable names in pop after appearing on The X Factor and rising to fame with the boyband One Direction in the 2010s before the band went on an indefinite hiatus in January 2016.
The singer’s funeral was held in Amersham, Buckinghamshire, last month.
His former bandmates Harry Styles, Louis Tomlinson, Niall Horan and Zayn Malik were among the mourners, alongside Payne’s girlfriend Kate Cassidy and his former partner Cheryl, with whom he shares a son.
