London, Jan 19 (Agencies): South African police chief General Bheki Cele has claimed that his detectives have uncovered a motive which explains why NRI businessman Shrien Dewani allegedly killed his bride while on honeymoon in Cape Town and plans to disclose it at the extradition hearing here on Thursday.

General Cele told the country's news channel that his officers now know why Dewani commissioned two hitmen to kill his wife Anni Dewani on November 13 last year.

However, he refused to give away the alleged motive, saying that "it will be revealed at an extradition hearing scheduled to take place in London this Thursday."

Anni Dewani, 28, was killed after the taxi she and her husband were travelling in was hijacked as it passed through a dirt poor township outside Cape Town.

Although four South Africans have been arrested in connection with the crime – and one sentenced to 18 years in jail – the country's police insist the plot was 'masterminded' by Dewani himself.

Dewani, who is currently on bail in Britain, denies his involvement. According to a report in The Daily Mail, Dewani may return to South Africa to face trial over taxi gun murder of his honeymoon bride.

His supporters point out that the South Africans have failed to provide even a flimsy motive which would explain why he allegedly killed his wife.

They also claim that the South Africans' naming of Dewani as a suspect is a ploy to detract attention from the country's appalling crime rate.

General Cele is a controversial, outspoken figure in South Africa. A career politician, he had no policing experience before taking on the top cop's role last year.

Four days after Anni was killed, he insisted that Dewani was 'not a suspect' in the case. He later admitted that he had been lying.

And after Dewani was formally named as a suspect, the policeman described him as 'a monkey who came all the way from London to murder his wife'.

The commissioner's comments are likely to be used by Dewani's defence team as evidence that he would not get a fair trial in South Africa.

Meanwhile, the case's senior detective Lieutenant Colonel Mark Barkhuizen is currently in London, where he has reportedly asked British police to help his investigation.

Tlali Tlali, spokesman for South Africa's Ministry of Justice, described the murder case again as a 'puzzle', the pieces of which the country’s detectives are still putting together.

He said: "The idea here is to put pieces of the puzzle together and be able to present a watertight case in court, should Dewani be extradited to South Africa to stand trial."

He went on to reveal that South Africa has requested "mutual legal assistance" from the British authorities, explaining: "We have a reason to believe that there are leads to be pursued there [in the UK] that could help us put pieces of the puzzle together."