'Sense of duty': Litvinenko's widow hopes for answers The memories still bring tears to Marina Litvinenko's eyes, over eight years after the horrific killing of her former secret agent husband by radiation poisoning under the glare of the world's media. As a public inquiry into Alexander Litvinenko's death is to begin in London on Tuesday, his widow said her campaign for answers stems from a "sense of duty" to the man she refers to by his diminutive "Sasha". IMAGES AND SOUNDBITES of an interview with Marina Litvinenko.