Mr. Cherkasov says Estemirova, one of a tiny handful of human rights workers to monitor the situation in Chechnya, was practically the sole surviving source of information on rights violations in the tiny war-torn republic, including the government's alleged use of death squads, kidnapping, and the burning of the family homes of unrepentant separatist rebels.
"She documented all the things that stood in contradiction to the pleasant image of Chechnya created by the authorities," he says.
Fourth prominent Kadyrov adversary to be killed
Estemirova, a single mother who lived in the Chechen capital of Grozny with her teenage daughter, was abducted outside her apartment building by armed men on Wednesday and bundled into a car. Her body was later found with gunshot wounds by a roadside in the neighboring republic of Ingushetia, which is also in the throes of a mounting insurgency by Islamist extremists.
Her murder is the latest in a growing toll of Kadyrov critics, including the late Anna Politkovskaya, an investigative journalist with the opposition weekly Novaya Gazeta and close friend of Estemirova, who was shot in her Moscow apartment elevator almost three years ago. Others killed in the past year include human rights lawyer Stanislav Markelov, gunned down on a Moscow street last January; Umar Israilov, a former Kadyrov bodyguard turned whistle-blower, murdered in Vienna in January; and Sulim Yamadayev, a former Chechen commander and Kadyrov foe, murdered in Dubai, United Arab Emirates, in March. Mr. Yamadayev's brother, Ruslan, was assassinated in Moscow last September.