(Beijing Comprehensive News) In 1994, Zhu Ling, a Tsinghua University alumni who was deliberately poisoned, died on Friday (December 22) in Beijing at the age of 50.The killer has not been found after nearly 30 years of poisoning.

Tsinghua University posted the news of Zhu Ling's death on the official Weibo on Saturday (December 23), and wrote that Zhu Ling had struggled with the pain for many years.Sincere condolences.

Comprehensive Southern Metropolis Daily Phoenix Weekly and other reports, Zhu Lingzhi Wu Chengzhi said in an interview that Zhu Ling died at 10:59 pm on Friday and said that the hospital had tried his best to rescue him.

Zhu Ling is a student of the Department of Chemistry of Tsinghua University in 1992. In November 1994, he had abnormalities due to poisoning.After diagnosis, Zhu Ling had twice poisoning twice. After the second poisoning, the content of the pupa in the body far exceeded the amount of death, causing her brain nerve to be damaged, paralyzed, and intellectual degeneration to 7 years old.Take care of the elderly parents.

Tsinghua University reported to the Public Security Bureau in May 1995 for suspecting that Zhu Ling was deliberately poisoned.Sun, who was in the same dormitory with Zhu Ling, was considered the only person who could get salt legal and approached Zhu Ling at the time, and was included in the investigation object by the police.However, the report on the poisoning test report was too late.

This case attracted attention in 2013, but the case has never been detected.

Zhu Ling found a brain tumor in April. In November, he was in a severe coma due to brain tumor. He spent his 50th birthday on the bed.