A Russian Investigative Committee spokesman told journalists that although "it is clear that the death of Yuri Shchekochikhin was not a crime," French forensics experts will look into the case.
Shchekochikhin was a long-time investigative reporter who also covered the war in Chechnya in the 1990s. He became a Duma deputy in 1995.
The official autopsy in July 2003 concluded that his death was allergy-related.
However, the journalist's colleagues insisted that Shchekochikhin's work as a reporter was the real cause.
Officials closed the case in 2009 but reopened it in 2010.
"Novaya gazeta" chief editor Dmitry Muratov said the Investigative Committee’s statement that Shchekochikhin's death was not a crime was "premature."