Prosecutors said Xolile Mngeni was hired by Mrs Dewani's British husband Shrien Dewani to carry out the killing, which was made to look like a car hijacking in Cape Town's impoverished Gugulethu township during the couple's honeymoon.
Following her death three men have been convicted. Anni's husband Shrien Dewani is fighting extradition to South Africa and continues to deny he orchestrated the killing. The convictions to date are:
December 2010: Taxi driver Zola Tongo is jailed for 18 years after making a plea agreement with prosecutors.
August 2012: Mziwamadoda Qwabe is jailed for 25 years after admitting murder.
November 2012: Xolile Mngeni is found guilty of killing Mrs Dewani.
More top news
Lively start to the week
White House budget officials outlined the information during a telephone call with reporters given on condition of anonymity.
A prison officer is to be charged with gross negligence manslaughter and misconduct in public office in relation to the death of an inmate.