Two men, Anzor Gubashev and Zaur Dadayev, have been charged over the murder of Russian opposition figure Boris Nemtsov
A judge said Dadayev had admitted to being involved in the killing.
Russian state investigators now say they have a total of five suspects in Nemtsov's murder.
One served in a police unit in the Russian region of Chechnya.
55-year-old Nemtsov, a former deputy prime minister, was shot dead near the Kremlin on February 27.
Russian officials have always denied involvement, despite accusations from some of Nemtsov's friends.
It's the most high-profile killing of an opposition figure in President Vladimir Putin's fifteen year reign.