The father of Alexander (Sacha) Litvinenko describes how he came to know his son became Muslim. This is part of the VPRO Backlight documentary called 'In Memoriam Aleksander Litvinenko'. Alexander Litvinenko is well known as the Ex KGB Russian spy who was poisioned by another active russian spy. Litvinenko turned to a Kremlin critic who blamed Russian President Vladimir Putin himself for his fatal poisoning by a toxic radioactive substance in his body. He discribed Putin as "barbaric and ruthless" .
It was not known that he converted to Islam untill a few days before his death due to the poison.