Russian award-winning journalist Anna Politkovskaya shot to death in an elevator

Russia has become one of the deadliest countries for journalists. Twenty-three journalists were killed in Russia between 1996 and 2005, many in Chechnya, according to the Committee to Protect Journalists. At least 12 have been murdered in contract-style killings since Putin came to power, Simon said.

"None of those have been adequately investigated," he said. "We do know that record creates an environment where those who might seek to carry out this murder would feel that there would be few likely consequences."

In addition to her daughter, Politkovskaya is survived by a son, Ilya, Panfilov said.