Cross-examination of convicted killer Mziwamadoda Qwabe was cut short after he told Judge Jeannette Traverso in the Cape Town High Court that he was suffering from stomach cramps.
Dewani's lawyer, Francois van Zyl, announced that Dewani also "had an upset stomach", and the trial was adjourned until Monday.
Dewani is accused of conspiring to have his 28-year-old Swedish-born wife Anni (nee Hindocha) murdered while they were on honeymoon in Cape Town in 2010.
He said Dewani's taxi driver had contacted him and said "there was a husband who wanted his wife to be killed".
Qwabe then detailed how they staged a hijacking, let the driver and Dewani go, and shot the woman before going out to party with the cash they had made for killing her.
Dewani has pleaded not guilty to murder and says he was forced out of the taxi at gunpoint before his wife was shot.
Dewani's formal written admissions to the court show his computer was logged onto a male gay website just hours after his wife's body was found.
He confirmed he registered for the 'Gaydar' website and 'Recon', a website for men into fetish gear, in 2004 with the username 'ASIANSUBGUY'.
Dewani has admitted to having paid for sex with male prostitutes but told the court he considered himself to be bisexual and that he loved Anni.
But he was sent back to South Africa in April, where he was found fit to stand trial.
