New details have become known related to police officer Mevlüt Mert Altıntaş, who shot dead Russian envoy to Turkey, Andrey Karlov.

Altıntaş took a day off on the day of murder, according to Diken news website of Turkey. Then he  went to a hotel located near the modern arts center in downtown Ankara.

Before carrying out his plan, he shaved, wore a black suit and a tie, and walked to the art center where the Russian ambassador was to deliver a speech.

Altıntaş worked the details of the murder directly at the hotel.

On Monday evening, a gunman attacked Russian envoy to Turkey, Andrey Karlov, while the latter was giving a speech at a photo exhibition dedicated to Kamchatka at Çağdaş Sanat Merkezi Contemporary Arts Center of Ankara.

Karlov was rushed to hospital in critical condition, but he could not be saved.

The assailant, who was shot dead by police, was later identified as Ankara police officer Mevlüt Mert Altıntaş.