A man who held his sister-in-law over a railing at a high-rise Sydney car-park after she took his wife to the beach has been jailed for at least two-and-a-half years.

In the District Court in Sydney on Friday, Judge Peter Zahra sentenced Ismail Belghar, 37, to a maximum four-and-a-half years' imprisonment for assaulting Canan Kokden and detaining her without consent in December 2009.

The court heard Ms Kokden was "convinced she was going to die" after Belghar slapped her, picked her up and held her over the car park railing from the chest upwards at Sydney's Broadway shopping centre, saying "I'm going to kill you, I'm going to femememing kill you".

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