The family of murdered bride Anni Dewani has petitioned the Home Secretary to ensure the young woman's husband, Shrien, is extradited to South Africa.
The British businessman is wanted in Cape Town on suspicion of ordering the killing, which was carried out on the couple's honeymoon last year.
Belmarsh Magistrates' Court in south-east London ruled last month he should be sent back to the country to stand trial. But the application to extradite the 31-year-old Bristol care home owner was then passed to Theresa May for her to make the final decision.
Twelve members of Mrs Dewani's family - keen to see him prosecuted for the murder as they want "answers" - have handed in a petition, which was said to have been signed by 11,000 people, to the Home Office.
Mrs Dewani's father, Vinod Hindocha, and brother Anish were joined by uncles, aunts and cousins, some of whom had flown in from their home country of Sweden. Mrs Dewani's mother, Nilam, had to remain at home as she was unwell.
Mr Hindocha, 62, said: "We need closure for this case and we demand that. Tell us the truth of what happened to Anni and why. That's all we want to know. We are waiting for the answers and the only way we can get these answers is by Shrien going to South Africa and giving us the answers."
He affirmed his faith in the British justice system and said the family is "quite confident" Ms May would help.
Mrs Dewani, 28, was shot dead after the cab in which she and her new husband were travelling was hijacked in the dangerous township of Gugulethu on November 13. Taxi driver Zola Tongo, who has admitted his part in the crime, claimed in a plea agreement with prosecutors that Dewani ordered the carjacking and paid for a hit on his wife.
Dewani, who is said to be suffering from severe post-traumatic stress disorder, denies any wrongdoing.
It is understood Ms May has until October 10 to make her decision on extradition.