The sister of honeymoon murder victim Anni Dewani has said she wishes she had told her to change her plans to marry husband Shrien.

Three weeks before the wedding, Anni threw the ring back at Dewani, Ami Denborg said.

She told Sky News: "She called me, I talked to her a lot that evening. She was saying a lot of things - 'It's not working well', and things like that.

"I thought she was just stressed out. Looking back, I should have told her ' All right, forget it, I'll support you, break this off'. Maybe she would have been alive today."

Businessman Dewani, 34, from Bristol, is to be tried in Cape Town next week for Anni's murder.

The millionaire is accused of ordering her murder during their honeymoon in November 2010. She was shot in the neck as the couple travelled in a taxi on the outskirts of the city.

Anni's father, Vinod Hindocha, told Sky: "I really hope we get to know what really happened. That's all we are asking for, tell us the truth. No father should ever go through what we are going through."

Her mother, Nilam Hindocha, said: "I felt there was something strange. She said 'I have a lot to tell you, I'll tell you when I'm back in Bristol'."

Dewani faces charges of conspiracy to commit kidnapping, robbery with aggravating circumstances, murder, kidnapping, and defeating the ends of justice.

He has previously claimed that the couple were kidnapped at gunpoint as they drove through Gugulethu township, and he was released unharmed but his wife's body was found in the abandoned car the next day.

Following a protracted legal battle over the seriousness of his mental health problems, Dewani, who was detained in a hospital in Britain for depression and post-traumatic stress disorder, was extradited from the UK in April to face trial.

Three men have been convicted and jailed over Mrs Dewani's death, including taxi driver Zola Tongo, who was given 18 years after admitting his role in the killing.

Xolile Mngeni, who prosecutors claim was the hitman, was convicted of premeditated murder over the shooting, and another accomplice, Mziwamadoda Qwabe, pleaded guilty to murder and was handed a 25-year prison sentence.