Katty Kay resigns from Ozy Media after a New York Times report about the firm.

The embattled digital media company Ozy lost one of its biggest stars on Wednesday, when Katty Kay, a former BBC anchor, announced on Twitter that she had resigned.

Ms. Kay said in her post that she had handed in her resignation Tuesday morning.

“I had recently joined the company after my long career at the BBC, excited to explore opportunities in the digital space,” she wrote. “I support the mission to bring diverse stories and voices to the public conversation. But the allegations in The New York Times, which caught me be surprise, are serious and deeply troubling and I had no choice but to end my relationship with the company.”

Ms. Kay’s announcement came a day after Ozy’s board said it had hired a law firm to investigate its “business activities” after a New York Times report raised questions about the company’s business practices.

The Times’s media columnist, Ben Smith, reported on Sunday that an Ozy executive had apparently impersonated a YouTube executive during a conference call in February with Goldman Sachs. The bank was considering investing $40 million in the company, a deal that did not come to fruition.

Founded in 2013 and led by the former MSNBC anchor Carlos Watson, Ozy has a general interest news site, publishes a raft of newsletters and produces interview programs and documentaries, some of which appear on YouTube.

This is a breaking news story. Check back for updates.