The trial is set to begin for three Australian men charged with the premeditated murder over the ambush of a Bali villa that left a father dead and another man injured.

The three accused men potentially face death by firing squad if found guilty.

Mevlut Coskun and Paea Middlemore Tupou are the alleged "muscle" and shooters in the suspected gangland hit, accused alongside Sydney plumber Darcey Jensen.

Australian father of six Zivan Radmanovic died in front of his wife, who was among his family in court today.

Jensen is accused of arranging the vehicles and equipment for the hit, claiming it was at the direction of a person in Australia.

His co-accused allegedly posed as delivery drivers before storming the villa.

Underworld figure Sanar Ghanim was also shot but survived the attack.

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