A 56-year-old woman with dementia is believed to have been strangled to death with a belt at home on Wednesday before her husband killed himself in a suspected murder-suicide, according to police. The family tragedy came to light shortly after 7.30am when police received a report from the elder brother of Au Kin-ming, 58, who plunged to his death from his 15th-floor flat in King Ying House on Fung Shing Street in Diamond Hill. Hong Kong families bear burden of dementia as patient numbers rise A source with knowledge of the case said Au killed himself after sending a text message to his siblings saying he wanted to commit suicide. He said the message, which was sent at about 4am, indicated that Au felt pressure and wanted to commit suicide because of his wife's illness. He used the word "hopeless" in the message. The woman had suffered dementia for about three years and the man had skin problems, according to the source. He said the elder brother noticed the message and called police at about 7.30am after he woke up. At the same time, Au was found by a cleaner and a security guard lying unconscious in a flower bed outside King Ying House, according to police. He was taken to United Christian Hospital where he was declared dead, according to chief inspector Robert Law Chi-yau of the Wong Tai Sin police district crime squad. Police later found the body of his wife, Fung Shuk-ying, 56, in bed inside the couple's flat.