Ramón Mercader was a Spanish NKVD agent and communist who killed Russian revolutionary Leon Trotsky with an ice axe in August 1940. He was sentenced to 20 years in prison and was honored with the title of Hero of the Soviet Union post his release in 1961. Over the years, Ramón Mercader has been the subject of many documentaries.
Volker Eckert was a German serial killer who murdered at least six women in Spain, France, and East Germany between 1974 and 2006. Although he confessed to only six murders, Eckert is believed to have murdered many other women in countries like the Czech Republic and Italy. He committed suicide on July 2, 2007, during his criminal proceedings.