It was understood that Zhu, a chemistry student at Tsinghua University in Beijing, had been exposed to the highly toxic substance thallium.
Paralyzed by thallium, the Chinese woman, who almost completely lost her eyesight and suffered brain damage, continued to live in need of 24-hour care.
The case of Zhu Ling, which is constantly on the agenda in China, has so far not resulted in legal charges against anyone.
San Wei, a classmate and roommate of the unfortunate woman, was investigated, but no charges were filed due to lack of clear evidence.
San, who changed his name over time, had posted many times on his social media accounts that he was innocent.
THALLIUM POISONING
In late 1994, Zhu first complained of abdominal pain and hair loss, but a few months later he slipped into a coma. Doctors concluded that Zhu had been poisoned with thallium, an odorless, tasteless and water-soluble light metal.
Suspicion centered on his roommate San because of his access to thallium stockpiles on campus, but it was later discovered that other students could have access to the toxic metal.
NO CRIMINAL ELEMENTS FOUND
Zhu Ling's parents blamed her roommate, who they said was jealous of her beauty and academic success.However, the investigation yielded no results.
Zhu Ling's relatives then launched a petition calling for the deportation of San Wei, who had moved to the US. The petition claimed that San's family had strong political connections and that this was how he had evaded the investigation.
In 2013, the Beijing Public Security Bureau announced that the investigation into San Wei was being conducted in a healthy manner and that the case would not be reopened, citing the excessive statute of limitations and insufficient evidence.Zhu Ling became one of the rarest people in history, dying at the age of 50, 30 years after being poisoned.
