On Thursday, a Russian court gave lengthy jail terms to five Chechen men found guilty of the contract killing of Nemtsov, but his allies insist the masterminds behind the crime remained unidentified.
Prosecutors had requested a life sentence for Dadayev.
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Nemtsov, a top political opponent of President Vladimir Putin, was shot late at night in 2015 as he was walking across a bridge just outside the Kremlin. His accomplices were handed 11 to 19-year prison sentences. Another suspect, Beslan Shavanov, resisted arrest and blew himself up, TASS reports.
Judge Yury Zhitnikov sentenced Anzor Gubashev to 19 years in an extra-security prison and his brother Shadid Gubashev to 16 years.More news: Defending champ Murray stunned by Querrey at Wimbledon
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Dadayev was formerly a member of an elite military unit in Chechnya under the command of Chechen leader Ramzan Kadyrov, a Putin ally.
Last month a jury found Dadayev and his associates guilty of organising the murder of Nemtsov in February 2015 as he walked...
They claim strong evidence points to Chechen leader Ramzan Kadyrov, who is loyal to the Kremlin, was behind the killing. Russian Presidential Spokesman Dmitry Peskov has declined to comment on the court's decision concerning the politician Boris Nemtsov's murder.
Vadim Prokhorov, a lawyer for Nemtsov's daughter Zhanna, said: 'The shortcoming of this sentencing is that those who ordered and organised this crime are not in the dock'.
Nemtsov's family said they "will continue to seek legal action against the organizers and the individuals" in the targeted killing.