Sergei Yatzenko

A poor man who was brutally tortured and murdered at the age of 45 by the Dnepropetrovsk Maniacs, as they recorded him suffer (a viral video known under the name of 3 guys 1 hammer)

Important warning: DO NOT EVER WATCH THAT VIDEO. DO TELL ANYONE TO WATCH IT. It will completely traumatize you/them for the rest of your/their existance. I didn't watch it myself, but I heard about it, and trust me, it is shock and gore at its purest form.