Mr Pang said he "begged" medical staff to keep his wife on life support for one more day until his sons, in their thirties, arrived. But he claims doctors refused and said they would be switching the system off in 30 minutes. His wife died shortly after it was turned off. He said: "Those doctors had no right to turn off that machine. I was begging them not to. My sons said they would be there in just over 12 hours.