Police have released CCTV of a white van after a 67-year-old man was hit and killed outside his home in Sydney's south-west on Wednesday.

Zac Andreou was getting into his car, which was parked on Clarence Street in Condell Park, just before 4pm when he was hit by the van.

He was thrown several metres down the road. The Toyota HiAce van continued driving north along the street and did not stop, police said.

Family members, including Mr Andreou's son Andrew Zacharia, rushed to the scene to help him.