An elderly man has died after falling into a trench in his backyard in Sydney’s west. The 91-year old lived alone and may have been trapped overnight, police say. Paramedics found the injured man alive when they were called to the home in Glenmore Park about 8am on Friday but he later died. Excavations were underway in the man’s backyard and it’s not yet known how long he was trapped in the trench. A report will be prepared for the Coroner.