he was once a kgb agent, bu turned into a local critic o russia when he was poisoned an london and made headline around the world a lethal toxin in a cup of tea it was a dirty bomb why was he killed to unravel the mystery, we follow the tail of a darke conspiracy are you threatened for your life we will meet and confront the prime suspect. did you put - in the teens and now, is the dange coming closer one man said shoe temp. an attack on the expert helping us with the story. people say this is neve going to happen here i know it can happen, here because it happened to m husband. hello, and welcome to dateline former russian agent alexander was a vocal critic of th russian government, but in his world access to informatio could make you a very rich man or a dead one. his murder set off a international investigation to discover who wanted hi silenced here s richard engel with sp games. a former russian agent, poisoned a multi millionaire found dead in