“I instructed the secretary of Chechen Republic Security Council Vakhit Usmayev to conduct a thorough investigation of reasons behind Zaur’s dismissal, to study his behavior, his mood before he left service… if court confirms Dadayev’s guilt then [it means that] by killing a person he committed a grave crime,” Kadyrov said on Instagram.
The Chechen leader said he believes Dadayev "would never make a single step against Russia for which he risked his life for years."
Shortly after the tragedy, Russian President Vladimir Putin ordered the Russian Investigative Committee, the Interior Ministry and the Federal Security Service (FSB) to set up a joint team to investigate the murder.
On Saturday, FSB chief Alexander Bortnikov named Dadayev among suspects detained in connection to Nemtsov's murder case.
Later that day a spokesman for the Security Council of Russia's Republic of Ingushetia told RIA Novosti that Dadayev served as deputy commander of a unit of the Chechen Republic Ministry of Internal Affairs's "Sever" battalion.
Earlier on Saturday, Moscow's Basmanny District Court ruled to arrest all five suspects in the assassination of the politician. Zaur Dadayev was the only one of them to plead guilty.