Hong Kong police have arrested a domestic helper on suspicion of murdering a 93-year-old widowed cancer survivor she was caring for, with an investigation suggesting the elderly woman was assaulted repeatedly in the hours before her death. The woman, surnamed Kwan, was found unresponsive in her flat in Long Yiu House at Tak Long Estate in Kai Tak on Sunday morning, police said. The 52-year-old helper, hired to provide round-the-clock care, sought help from building security staff at about...