Relatives and friends of the man accused of faking sign language interpretation at Nelson Mandela's memorial service have claimed he was involved in the killing of two men who were burned to death in 2003.
The men were said to have been found with a stolen television by a group of people who then set fire to tyres placed around their necks.
The four unnamed sources told the Associated Press that Thamsanqa Jantjie did not go on trial for the killings alongside the other suspects in 2006 because the authorities determined he was "not mentally fit to stand trial".
He was reportedly institutionalised for a year before he began working as a sign language interpreter at events for the governing African National Congress.
AP said Mr Jantjie was unavailable for comment.