MOSCOW, February 1 (RAPSI) – The Moscow City Court has upheld a lower court’s decision to extend detention of Zaur Dadayev, an alleged killer of Russian opposition politician Boris Nemtsov, until February 28, RAPSI reports from the courtroom.

Defense lawyer, Shamsutdin Tsakayev, asked the court to release Dadayev as the investigation is completed and he cannot obstruct evidence gathering or put the heat on witnesses.

All the suspects will get acquainted with case materials soon, and then they would be forwarded to the prosecutor's office for indictment.

Nemtsov, 55, was murdered in central Moscow as he walked across a bridge near the Kremlin on February 28, 2015.

Five suspects were detained in the case, including the suspected trigger man Zaur Dadayev. He initially confessed to the killing but later said in court that he made the admission under pressure.

In December, police named the alleged mastermind behind the high-profile murder, Ruslan Mukhudinov, a former officer in Chechen Interior Ministry.

Mukhudinov was added to a federal wanted list and placed on an international wanted list. He fled Russia using a fake passport, according to investigators.

Vadim Prokhorov, a lawyer for the Nemtsov family, said that Mukhudinov was unable to have masterminded the murder.