Three men allegedly part of a "kill crew" sent to kill an organised criminal network member have been charged with kidnapping and murdering his wife in south-west Sydney.

Thi Kim Tran, 45, was at her home in Bankstown about 10.30pm on April 17 when a group of men allegedly forced their way in and kidnapped her at gunpoint.

They allegedly assaulted an eight-year-old boy with a baseball bat, putting him in a coma, before forcing the woman to strip naked on the street and forcing her into an SUV.

A 15-year-old boy at the home was also taken to hospital for assessment.

About an hour later, a car was found burning on Welfare Avenue in nearby Beverly Hills.

Fire crews extinguished the blaze, but the car was destroyed and police found Tran dead inside.

Police allege the woman was like

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