Boris Nemtsov's girlfriend Anna Duritskaya, who was with him when he was murdered, is being intensely questioned by authorities. CNN's Diana Magnay reports.
Cable News Network (CNN) is a U.S. cable news channel founded in 1980 by American media mogul and philanthropist Ted Turner. Upon its launch, CNN was the first channel to provide 24-hour television news coverage, and the first all-news television cha...