Ai Wa was dead.

Forensic testing showed that she had been strangled to death.

And the murder weapon was in the hands of Bai Yongwei.

"No, no! I am not the killer!" Bai Yongwei shouted at the prison officers hysterically.

"Mrs. Bai," one of the captains said, looking at her with a serious look, "only you and she were in there, and you have the weapon that she was strangled with."

The so-called weapon was one of Bai ...