DOCUMENTARY PREMIERE: This documentary is so engrossing, and so fascinating a forensic mystery, that it’s a very good bet it’ll be turned into a movie, or made-for-TV movie, before too long. But truth, in this case, isn’t only stranger than fiction – it’s bound to be more fascinating. This is the story of how former KGB officer Alexander Litvinenko, living in London in exile, died suddenly in 2006 by very strange circumstances. So strange that, according to the New Scotland Yard and other British investigators who examined the man’s death, the former Russian spy was poisoned by an astoundingly rare radioactive element – so rare that its provenance can be traced directly to Vladimir Putin’s regime.