Story highlights Ex-Putin aide Mikhail Lesin was found dead in a hotel room

He died of 'blunt force', officials say, following an autopsy

(CNN) A former aide to Russian President Vladimir Putin died of blunt force injuries to the head, officials said Thursday.

Mikhail Lesin, 57, also sustained injuries to his neck, torso, arms and legs, a statement from Washington D.C.'s Medical Examiner's Office said.

Dustin Sternbeck, the D.C. police department's chief spokesman, told the Washington Post that the case remains under investigation.

He would not say whether the medical examiner's ruling means a crime may have been committed.

"We're not willing to close off anything at this point," Sternbeck said.

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