Zaur Dadayev, one of two suspects charged with the murder of Russian opposition politician Boris Nemtsov, confessed under duress, a member of Russia's Human Rights Council says.
Andrei Babushkin, who visited Mr Dadayev in prison on Tuesday, says wounds on his body suggested he had been tortured.
Investigators say the visit was to check confinement conditions only and have warned of interference.
Mr Nemtsov was killed on 27 February.
Mr Dadayev and Shagid Gubashev, who both originate from Chechnya, were charged with his killing on Sunday. Three other men are being held in connection with the case.
After visiting them in prison on Wednesday, Mr Babushkin said there were "reasons to believe Zaur Dadayev confessed under torture".
He called for "people not involved in the investigation" to look into the claim.
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