The woman, aged in her 60s, called triple-0 at 4am on Friday to say that she and her husband had been attacked in their home on Elizabeth Drive in Badgerys Creek.

The woman told police three men had smashed their way into their home before bashing them with weapons.

Police and paramedics arrived a short time later to find the body of the man, who is believed to be aged in his late 60s. He had suffered severe head injuries.

The man's wife also suffered head injuries and was bleeding heavily when police arrived. She was taken to Liverpool Hospital for treatment.

Police say the couple have no obvious criminal links, and initial investigations suggest the offenders may have been attempting to rob the home.

A NSW Police spokeswoman said the woman was seriously injured, and detectives had not been able to speak to her to find out further details about what had occurred.

The spokeswoman said it also was unclear when the attack occurred, as it was possible the woman had been knocked unconscious in the attack.

Homicide squad detectives have set up an extensive crime scene and are examining the single-storey home, which is located on a semi-rural property near the intersection with Lawson Road.

Elizabeth Drive has been closed at Lawson Road while police investigate.

The NSW Police spokeswoman was unable to confirm reports that baseball bats were among the weapons used in the attack.

Anyone with information has been urged to call Crime Stoppers on 1800 333 000 or visit the Crime Stoppers online reporting page.

smh.com.au