USA TODAY US Edition Russian mystery 2017-05-02 - Among suspicious deaths: EVGENY FELDMAN, AP AFP/GETTY IMAGES car bomb July 20, 2016 Pavel Sheremet, AP gunned down, 2006 Anna Politkovskaya, EPA blunt force trauma, November 2015 Mikhail Lesin, AP Alexander Litvinenko, polonium-210 poisoning, 2006 ANDREW BURTON cardiac arrest Feb. 20 Vitaly Churkin, AFP/GETTY IMAGES shot Feb. 27, 2015 Boris Nemtsov,