From CNN: Full statement by Alexander Litvinenko.
You may succeed in silencing me but that silence comes at a price. You have shown yourself to be as barbaric and ruthless as your most hostile critics have claimed.
You have shown yourself to have no respect for life, liberty or any civilized value. You have shown yourself to be unworthy of your office, to be unworthy of the trust of civilized men and women.
You may succeed in silencing one man but the howl of protest from around the world will reverberate, Mr. Putin, in your ears for the rest of your life.

From FoxNews: British Airways to Contact Passengers After Traces of Radiation Found on Planes.
Two British Airways jets tested positive Wednesday for low-level radioactive contamination as the probe into the apparent murder of a former KGB agent uncovered a trail leading directly from London to Moscow.
FOX News has learned that British authorities are checking into whether anyone onboard the planes are associated with the radiation poisoning death of ex-Russian spy and Kremlin critic Alexander Litvinenko. ...
Litvinenko, who died Nov. 23 in a London hospital, claims Russian President Vladimir Putin was behind his death.
The former spy said he believed he had been poisoned on Nov. 1, while investigating the death of another Kremlin detractor investigative journalist Anna Politkovskaya. His hair fell out, his throat became swollen and his immune and nervous systems were severely damaged, he said.