The murder of Buckinghamshire woman Shani Warren was the subject of a new Channel 5 documentary last night (May 3).

Dark Water: The Murder Of Shani Warren aired at 9pm, telling the story of how the murder of the 'lady in the lake' was solved by Thames Valley Police.

After over three decades of mystery, the new television documentary revealed some details surrounding the death of Shani Warren, whose body was discovered floating face down in a lake in Taplow in 1987.

Shani Warren was a 26-year-old secretary who had driven to her parents' house in Gerrard Cross on Easter 1987 to borrow an extension cable to cut the grass where she lived in nearby Stoke Poges.

At around 6 pm on the same day, Shani was seen loading grass cuttings into her black Vauxhall Cavalier before driving off. However, her car was found almost six miles away in a layby off the A4 at Taplow, with her body discovered floating face down in a nearby lake.

The investigation into Shani's death, known as the lady in the lake case, revealed some disturbing facts.

Shani's body had her hands tied behind her back with a red jump lead from her car and her ankles bound with a yellow rope.

Additionally, a scarf was found around her mouth, and a ligature had been put around her neck, resulting in her drowning.

Detectives from Thames Valley Police were in no doubt that they were dealing with a killer, with the lake where Shani's body was found just a short walk from where her car was abandoned.

However, despite extensive investigations, Shani's death remained unsolved for over three decades.

Now, a new TV documentary has revealed some information about the case.

Donald Robertson, 66, formerly of Slough, was found guilty by a unanimous jury at Reading Crown Court on May 2022 of the murder and indecent assault of Shani Warren.

Robertson was also found guilty of the rape, kidnapping and false imprisonment of a 16-year-old girl in Slough in June 1981. The girl cannot be named for legal reasons.