A prominent Russian millionaire with high-level ties to the Kremlin has been found dead inside a Washington hotel, a Russian official and a senior U.S. official told ABC News.

Mikhail Lesin, the former head of media affairs for the Russian government who’s been accused of curtailing the country’s press freedoms, had been staying at The DuPont Circle Hotel when he was found Thursday, according to officials.

It’s unclear why the long-time adviser to Russian President Vladimir Putin was in Washington, but the Metropolitan Police Department is now investigating his death. On Thursday, U.S. authorities notified the Russian embassy in Washington that one of its citizens had died, and Russian officials are now working with American authorities to determine the circumstances of the death, the embassy told ABC News in a statement.

Citing an ongoing investigation, an MPD spokesman would only confirm the department is conducting a “death investigation.”

Lesin is credited with creating Russia Today, the English-language news network backed by the Russian government. Now known as RT, the network “provides an alternative perspective on major global events, and acquaints an international audience with the Russian viewpoint,” according to its website.

Lesin “led the Kremlin’s efforts to censor Russia’s independent television outlets,” one U.S. lawmaker charged last year.

In fact, Sen. Roger Wicker (R-Miss.), called on the Justice Department to launch an investigation into Lesin over allegations of corruption and money laundering.

In a letter to then-Attorney General Eric Holder, Wicker said Lesin had “acquired multi-million dollar assets” in Europe and the United States “during his tenure as a civil servant,” including multiple residences in Los Angeles worth $28 million.

“That a Russian public servant could have amassed the considerable funds required to acquire and maintain these assets in Europe and the United States raises serious questions,” Wicker wrote.

It’s unclear if the FBI ever begun a probe.

From 1999 to 2004, Lesin served as Russia’s Minister of Press, Television and Radio, often traveling with Putin on official trips. In 2013, he became head of Gazprom-Media Holding, the state-controlled media giant that describes itself as one of the largest media groups in Russia and Europe. Lesin resigned the next year, reportedly citing family reasons.

This story has been updated to reflect the official name of the hotel.