Yury Budanov served six years in prison for war crimes in Chechnya before his parole in 2009. His assassination could be a revenge attack or an attempt to stir ethnic strife.
Russia arrested the suspected triggerman in the killing of Anna Politkovskaya five years ago, but her family says justice will come only if the 'masterminds are found and punished.'
Anna Politkovskaya was murdered three years ago, but her killers have not been brought to justice. Russian journalists say that's a sign of how dangerous their jobs have become.
President Putin's chosen successor, he kicked off his campaign Tuesday with a Kremlin-sponsored speech.