No justice 5 years after Vic dad's murder

It's been five years since a Victorian father was fatally shot outside his business, but those responsible remain at large.

Saleh Dheibech was found in a pool of blood outside his Campbellfield panel beating business on January 27, 2010, and later died in hospital.

Police believe a blue Subaru WRX, containing three people known to Mr Dheibech, drove past and fired a single shot at the 51-year-old about 9pm.

Mr Dheibech's murder, five years ago on Tuesday, remains unsolved.

A $1 million reward was announced last month for information leading to a breakthrough.

Police believe they know who was involved in the shooting, which was likely triggered over a work matter.

Inspector Stephen White said detectives wanted closure for Mr Dheibech's family.

"They deserve for someone to be found responsible for this senseless death," he said.