Russian Investigative Committee is preparing to indict five men over the death of opposition leader Boris Nemtsov, following 11-months into his assassination.
The investigative committee, Russia's top investigative body, said in a statement that investigators would file the final charge against five men later on Tuesday.
The committee also said that they will collect the probe files in January.
The committee will charge them with "a contract murder committed by an organised group and the acquisition, transport and storage of illegal firearms."
A surveillance video shows he was shot down on February 27, while he was walking outside the Kremlin. Five Chechen men have been arrested over charges of involvement in the killing, however the motive for the attack and the person who ordered the killing is still unknown.
After his death, Putin condemned the killing and ordered three law enforcement agencies to investigate.
Suspects who have been identified are Zaur Dadayev, Anzor Gubashev, Shadid Gubashev, Tamerlan Eskerkhanov and Khamzat Bakhayev.
The main suspect in the investigation is the deputy head of an elite police unit, Zaur Dadayev, and the main suspect over the assassination is Chechen leader Ramzan Kadyrov.
One of the four suspects killed during the arrest is also from Chechnya.
According to statements, investigators will continue to work on the case against Ruslan Mukhudinov, who has been on an international wanted list since November over the hire of Nemtsov’s killer.
Nemtsov, 55-year-old physicist and a liberal politician under former Russian President Boris Yeltsin was one of the most important figures who introduced capitalism into the Russian post-Soviet economy.
A 64-page report published by opposition, called “Putin War,” was originally drawn up by assassinated opposition leader Boris Nemtsov and was completed and published by opposition figures led by Ilya Yashin.
The report was shared with journalists in Moscow at the headquarters of the RPR-PARNAS party, which was founded by Nemtsov before his death.