Updated at 12.44pm: Police on Friday are probing a robbery and murder case in which a 74-year-old woman died at her home in Wong Tai Sin in Kowloon late on Thursday. A spokesman said the woman was found lying unconscious on a bed at her home at Wah Yuen House, Chuk Yuen South Estate. The woman?s daughter-in-law discovered her on Thursday night. The spokesman said the elderly woman?s hands and legs were tied. Detectives also discovered signs of ransacking inside the unit. ?Initial inquiries revealed that some HK$10,000 cash was missing,? the spokesman said. The woman was rushed to Queen Elizabeth Hospital, but was certified dead at 12.13am on Friday. A post-mortem will be conducted later to ascertain the exact cause of death, the spokesman said. Further details about the case were not yet available. Investigations by the Regional Crime Unit of Kowloon East were proceeding on Friday.