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Steven Brooks	Barbara Brooks	Stacey Willoughby

A large reward is being offered for information into the triple murder of a family in Deniliquin in March 2000.

The NSW Government is offering $250,000 for information leading to the conviction of person or persons responsible for the shooting murder of 38-year-old Steven Brooks, his wife Barbara, 34, and her son 13-year-old Stacey Willoughby.

On Thursday March 16, 2000 the bodies of Mrs Brooks and Stacey were found in their family car in the Millewa State Forest, 55km south of Deniliquin.

Four days later, the body of Steven Brooks was found in bushland 500 metres from where the bodies of his wife and stepson were earlier located. All three had been shot to the head with a .22 calibre weapon.

The family were last seen sitting in a car with an unknown man in Deniliquin's main street, the afternoon before their bodies were found. The identity of the man has never been established.

State Crime Command Homicide Squad detectives commenced Strike Force Rodi in 2000 to investigate the slayings but despite an extensive investigation no person has been charged.

Deniliquin man, Damiano Marando, was identified as a person of interest during an inquest held in Deniliquin in 2001 but Deputy State Coroner Jacqui Milledge found insufficient evidence for any charges to be preferred.

Homicide Squad Detective Inspector Hans Rupp described the murders as extremely heinous.

"This was an execution style killing of the worst kind with the life of a young boy taken in the most violent of circumstances," Det Insp Rupp said.

"We are appealing to anyone with information to come forward and assist detectives in finding the monstrous criminal or criminals responsible."