US director Mann to direct Litvinenko film
US actor Johnny Depp is reportedly producing a separate account of his life and death.
The confirmation came on the day Marina Litvinenko's book "Death Of A Dissident: The Poisoning Of Alexander Litvinenko And The Return Of The KGB" is released in Portugal.
"A film version of the book is being developed by Columbia Pictures and will be directed (by) Michael Mann," the foundation told AFP.
Like Litvinenko the foundation is also based in London.
Litvinenko, an outspoken critic of Russian President Vladimir Putin, died in a London hospital last November from radiation poisoning after apparently accusing Putin of involvement, a charge the Kremlin denies.