Jensen Huang, CEO of the chipmaking juggernaut Nvidia, is stepping down.

The decision comes days after the company took the extraordinary step of launching an investigation following news reports alleging that Huang had had an extramarital affair with one of the company’s clients, who U.S. intelligence officials concluded had been recruited by China’s top spy agency, according to the New York Times. NPR has not independently confirmed those reports.

In an email to Nvidia staff on Sunday, Huang admitted to cheating on his wife, and said he would cooperate with the investigation.

The company’s share price dropped sharply on Wednesday, after the New York Times reported that Huang had had a second affair, this one with an Nvidia executive who reported to him.

Nvidia did not immediately respond to an NPR request for comment.

Huang was widely seen as one of the most important business leaders in the United States. Nvidia dominates the market for the chips used to train and run artificial intelligence. Huang also had President Trump’s ear on AI policy, with Trump even calling Huang’s phone in September while Huang was onstage during a conference.

The scandal that brought down Huang snowballed quickly over the past two weeks. The New York Times reported in late October that Huang had a close relationship with a Chinese woman at a Singapore-based company that was buying Nvidia chips. Citing unidentified sources, it said U.S. intelligence officials believed she had been recruited by the Chinese government to spy on him and possibly try to influence policy. NPR has not independently confirmed this reporting.

A drip-drip of scoops followed — from the Times and other outlets — suggesting that the relationship was romantic, that senior Trump administration officials knew about the allegations some time ago, and that Huang had had a second affair.

China’s foreign ministry has said the allegations of spying are baseless and part of a smear campaign against China.

Huang’s departure launches Nvidia into uncharted territory.

“There’s no obvious replacement,” said Stephen Witt, author of a book about Nvidia called The Thinking Machine. “It’s not even clear Nvidia can be the same kind of company without Jensen. I have a hard time imagining what Nvidia looks like without Jensen.”