Chris Marriott, 46, died after going to the aid of a woman lying motionless in the street, a jury at Sheffield crown court was told yesterday.
The prosecutor Tom Storey KC said Marriott was killed by a car driven and "used as a weapon" by the defendant, Hassan Jhangur, 24.
Marriott died instantly and the woman he was helping, the defendant's sister, Nafeesa Jhangur, was seriously injured.
Jhangur has denied the murder and manslaughter of Marriott but admitted causing his death by dangerous driving, the jury heard.
Storey said the background to the events which took place on 27 December last year was a dispute between two families over a wedding that took place that morning between Hasan Khan and Amani Jhangur, a sister of the accused.
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