SA investigators are hoping to build a "watertight" case against Shrien Dewani during the UK leg of their investigations into the murder of Dewani's wife Anni, the justice department said on Thursday.
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"The idea here is to put pieces of the puzzle together and be able to present a watertight case in court," should Mr Dewani be extradited to SA to stand trial," said spokesman Tlali Tlali.
The South African government made two requests to the UK authorities --one for the extradition of Dewani and the second for mutual legal assistance.
Anni Dewani was murdered on honeymoon in December after an apparent spur-of-the-moment decision to visit Gugulethu outside Cape Town on the way home to Cape Town from a beachside dinner.
A shuttle bus driver Zola Tongo was sentenced to 18 years in prison in December in a plea agreement that implicated Dewani and two other people in Anni's murder.
Earlier Justice Minister Jeff Radebe was quoted as saying on SABC that Dewani's right to a fair trail was protected in terms of the Constitution.
"He is presumed innocent until proven otherwise. He has a right to be represented by legal counsel and he can be able to challenge any evidence that can be used against him," he said.