Sneha Mashru, a cousin of Dewani's wife Anni, said he told her the attackers had promised him they would not harm his bride but suggested they changed their minds and shot her because she would not be quiet.
"He (Dewani) said Anni was screaming: 'Let us go, let us go, we're on our honeymoon, let us go'," Mashru told the judge at the Western Cape High Court here.
Meanwhile, defence lawyer Francois van Zyl claimed that Dewani bought around 100 saris for Anni, after their wedding in India, as he attempted to discredit Mashru's view that the couple were in an unhappy marriage.
Mashru has given detailed descriptions over the past two days of communication between her and 28-year-old Anni in which her cousin explained her unhappiness with her husband.
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The court was adjourned for a short while when Mashru broke down as she recalled tending to Anni's body for the funeral.
The next witness in the trial was Sergeant Cornelius Jacobus Mellet of the South African Police Services, who took Dewani back to the Cape Grace Hotel after he was allegedly left unharmed in the carjacking in which Anni was killed on November 13, 2010.
Mellet said on the way to the hotel Shrien was "sweating and was very nervous", to the extent that he felt sorry for him and turned on the air conditioning in the car.
The policeman also said that it was "strange" that on the way to the hotel, Dewani did not mention his wife.