Police have revealed the identity of a suspected murder victim whose mummified corpse was found in a ramshackle home on Sydney's lower north shore.

The body, which has been inside the Greenwich property for at least 10 years, was on Tuesday named as Shane John Snellman.

Mr Snellman sustained a number of injuries and his death is being treated as suspicious.

"At this stage, it is unknown when he died," NSW Police said in a statement.

The property was owned by Bruce Roberts, who has been described as a recluse and hoarder. He died of natural causes in July 2017.

Cleaners sent to clear out the Greenwich property last Tuesday discovered the skeletal remains along with Mr Roberts' junk.

The remains were so badly decomposed a post-mortem examination was required to determine the gender and age.

Mr Snellman was believed to have been estranged from his family for many years, with no missing persons' report having ever been filed, according to News Ltd.