Police offer $1m reward to find father suspected murdered by organised crime

A $1 million reward is being offered by police to help find a father who they suspect was murdered by organised crime figures more than two decades ago.

Mahmoud Sleiman, who was 24 at the time, was last seen outside his Greystanes home in Western Sydney on February 2, 2003.

NSW Police said Mr Sleiman was speaking with a man in a white Jeep Grand Cherokee, before he hopped in and was driven away.

Family reported him missing later that day.

At the time, the family said when they called his mobile phone later that night, they could hear a man screaming before the call ended.

Investigators have information Mr Sleiman had been involved in disputes with criminal rivals before he disappeared.

Detectives believe he was killed shortly after he was last seen.

Extensive searches looking for Mr Sleiman have been conducted, including in bushland at Moxham Reserve in Northmead and sections of the nearby Parramatta River in February 2004.

A coronial inquest in June 2007 found Mr Sleiman had died, likely on the day he disappeared, although no likely cause of his death was determined.

The State Crime Command's Unsolved Homicide Unit under Strike Force Motoren has taken over the investigation.

No-one has been charged and Mr Sleiman's body has never been found.

His son Billy and his partner Jody were expected to make a public appeal for information on Wednesday.