What happened before Chinese semiconductor scientist Wang Danhao took his life in the US?

The ashes of Chinese researcher Wang Danhao have been returned to his home in China, nearly four months after he died by suicide following questioning by US law enforcement. The remains of the 31-year-old University of Michigan (UMich) semiconductor scientist – remembered by colleagues as a gifted, hard-working researcher with a bright future – are now with his mother, his only immediate family me