Matthew Leveson (Facebook Supplied)

Police will be giving a $100,000 reward for anyone who could give valuable information regarding Matthew Leveson, who went missing since 2007.

It was four years ago when 20-year-old Matthew Leveson disappeared. He was last seen with his boyfriend Michael Peter Atkins leaving a nightclub in Sydney's inner city community at Surry Hills around 2 a.m. on Sept. 23, 2007.

He did not report for duty and couldn't be contacted after the incident. The last text message that was retrieved from his mobile was sent to a friend at 3:30 a.m. showing his being annoyed at one person, who was believed to be Mr. Atkins.

Since the day that he disappeared, his father Mark Leveson never stopped searching for his son's body for countless nights. His father believed that Matthew's body is just somewhere around Sydney's Royal National Park.

Mr. Leveson knows that there is no accurate information or proof that his body is in the park, but he believes something needs to be done. Looking for Matthew's body in the park is a helpful move to start with said Mr. Leveson while being interviewed by Sydney Morning Herald.

Two cars were discovered by police abandoned at Waratah Oval, Sutherland on Sept. 27.

Matthew's body was never found despite the extensive investigation done by the police.

Meanwhile, Atkins was charged with murder in 2008, but was acquitted and given a lesser sentence by the jury.

To anyone, who might be interested to help in the search for Mr. Leveson, he is described as Caucasian in appearance with a height of about 175cm, a thin build, and short blond hair.

He was wearing white leather shoes and light-brown cargo shorts with a black singlet on the day he was last seen.

The investigation still continues. Michael Gallacher, NSW Minister for Police and Emergency Services, will grant the reward to anyone who could provide a good lead to the discovery of Mr. Leveson's body.