After Brian Jones was found dead in his swimming pool in 1969, the authorities quickly decided that the Rolling Stones star had drowned accidentally.

But questions have lingered over the case in the years since, and now a previously unseen witness statement has cast renewed doubt on the police investigation.

Jones was found dead at his home in Hartfield, East Sussex on July 2 1969, just a few weeks after it was announced he was leaving the Rolling Stones. He was 27 years old.

Five days later, the coroner recorded a verdict of death by misadventure, saying Jones drowned “whilst under the influence of alcohol and drugs”.

Two weeks after Jones died, Joan Fitzsimons, 29, was brutally attacked. A local cab driver, she had been at Jones’s house on the night he died and was a girlfriend of Frank Thorogood, a builder-cum-minder for Jones who was allegedly a suspect in the fatal drowning.