The 24 year-old was shot dead outside a restaurant.
Lemalu was a senior figure in that group after cutting ties with a gang linked with Sydney’s Alameddine family.
It’s their wrestle for the drugs trade which has seen escalating violence across the city.
In the Vietnam footage, a hooded hitman in a hat exits a restaurant circling behind Lemalu and his associates before unleashing several shots from a pistol.
Lemalu ran inside and crashed onto the floor.
Police are investigating if the shooting is linked to the ongoing feud.
A second member was also reportedly shot.
Photos show men lying covered in blood on the floor of a restaurant in the aftermath of the shooting.
Trang Bang Ward Police in Tay Ninh have released images and names of two Australian men they want to speak to in connection with the shooting.
Retired NSW Police sergeant Glenn Gorick said the assassination was a “warning”.
“If they can find you in Vietnam they can find you anywhere,” he said.
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