Johnny Depp's production company, Infinitum Nihil, will develop a film based on an as-yet-unwritten book about the poisoning death of former KGB agent Alexander Litvinenko.

The movie will be an adaptation of the novel "Sasha's Story: The Life and Death of a Russian Spy," which is scheduled to come out later this year, Variety reports.

Shortly before his mysterious death last year, Litvenenko claimed that Russian president Vladimir Putin's government was behind his poisoning -- a claim that the Kremlin has categorically denied.

Sources say Depp followed the incident closely and is interested in playing the former spy.

Depp's next film, "Pirates of the Caribbean: At Worlds End," is slated for release on May 25.