When did Cai Guosheng's wife die?

Cai Guosheng, male, was born in 194 1, and his native place is Dinghai, Zhejiang. China modern calligrapher, expert in cultural relics appraisal, member of China Calligraphers Association. This is a famous name in the field of cultural relics appraisal in China. He has been engaged in the appraisal of cultural relics and antiques for more than 40 years, and has published 20 works by Yu Ben, such as Guide to the Appraisal of Treasures and Antiques, Fu of Epang Palace, Official Book of Cai Guosheng, Passing Clouds-Cai Guosheng's Talk on Antique Appreciation, etc., and is known as a "high-yield expert" in the field of cultural relics appraisal.