Sergei ##sky says he does n't believe Russian tycoon took his own life . The 67-year - old was found hanging at ex - wife 's Berkshire home in 2013 . Berezovsky had suspected of conspiracy to topple billionaire stocks , it is alleged . Sokolov claims Russian tycoon was killed by Western security forces . An outspoken critic of capitalism , Berezovsky had sent him ' repentance ' letter .
Sergei Sokolov says he does n't believe Russian tycoon took his own life . The 67-year-old was found hanging at ex-wife 's Berkshire home in 2013 . Berezovsky had evidence of plot to topple President Putin , it is alleged . Sokolov claims Russian tycoon was killed by Western security services . An outspoken critic of Putin , Berezovsky had sent him 'repentance ' letter .