Li Wenliang, the doctor in China who was allegedly detained for warning others about the coronavirus before contracting the illness, has died, according to the hospital treating him.

Earlier on Thursday, there had been conflicting reports about his death, and Wuhan Central Hospital said in a social media post just after midnight local time that he was in "critical condition." Later, an updated post announced his death.

Li was "unfortunately infected during the fight against the pneumonia epidemic of the new coronavirus infection," the hospital said. "We deeply regret and mourn this."

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Li, who according to the BBC is a 34-year-old ophthalmologist at Wuhan Central Hospital, had claimed that in late December he shared his concerns about the illness via private chat with medical school graduates after several patients exhibited symptoms similar to SARS before he was visited and warned by authorities.

He was then summoned to Public Security Bureau where he was forced to sign a letter stating that he made false comments about the virus, the BBC reported. Authorities later apologized.

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Shortly after, he began coughing and developed a fever that landed him in the hospital for several days. On Jan. 30, he tested positive for the virus.

Rumors of his death first began circulating Thursday on social media and health blogs in China. It is not known if Li had any underlying health complications that may have impacted the severity of his illness. Hours before the hospital confirmed his death, World Health Organization (WHO) officials had expressed sorrow over his passing in response to a reporter's question at a press conference. A spokesperson later told Fox News that the agency did not have updated information about his current health status.

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The novel coronavirus has sickened more than 28,000 worldwide and resulted in at least 563 deaths. About 99 percent of cases have occurred in mainland China, although two deaths have been reported outside the country including in the Philippines and Hong Kong.

The Associated Press contributed to this report.