Politkovskaya reported on human rights abuses in Chechnya, was shot dead in the elevator of her Moscow apartment building on Oct. 7, 2006.

 Colleagues of investigative reporter Anna Politkovskaya on Thursday sharply criticized the Russian authorities for failing to track down the mastermind of her killing 15 years ago, saying the official inquiry has effectively fizzled, the Associated Press reports.

Politkovskaya, who won international acclaim for her reporting on the human rights abuses in the Russian republic of Chechnya was shot dead in the elevator of her Moscow apartment building on Oct. 7, 2006.

In 2014, a court in Moscow convicted the gunman and three other Chechens involved in the killing along with a former Moscow police officer who was their accomplice. Another former police officer involved in the killing made a deal with authorities that allowed him to qualify for a reduced sentence in exchange for cooperation with investigators.

Politkovskaya’s newspaper, Novaya Gazeta, castigated the authorities for failing to determine who ordered the killing, noting that under the Russian statute of limitations, the mastermind wouldn’t face punishment 15 years after the crime unless a court rules otherwise.

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