Three men accused of being part of a "kill crew" have been charged after a mother was brutally kidnapped and murdered.

The body of Thi Kim Tran, 45, was found in a burned-out car in Beverly Hills in Sydney's southwest on April 17.

Investigators allege her husband was involved with an organised crime gang in Melbourne.

When the three men couldn't find him, they instead killed Ms Tran and injured their son, eight, by beating him with a baseball bat.

The incident began when police were called to a home in Bankstown after reports of a kidnapping.

They were told a group of people armed with a firearm had pushed their way in and assaulted the boy before forcing the woman into a car.

About an hour later, the car was found ablaze in Beverly Hills with Ms Tran's body inside.

"Police will all

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