Russian journalist Arkadiy Babchenko, who was working for the Ukrainian TV channel ATR, was killed in Kiev on Tuesday, Ukrainian authorities said.

Ukrainian lawmaker Anton Gerashchenko wrote on Facebook that Babchenko was shot in the back on the stairwell of his house and died in the ambulance on the way to hospital, Xinhua reported.

Kiev police chief Andriy Kryschenko told local media that Babchenko’s professional activities as a journalist would be examined in the investigation to seek the motive of the murderer.

Babchenko, 41, had worked as a war correspondent in Moskovsky Komsomolets and several other Moscow-based media.

He moved from Moscow to Prague, capital of Czech Republic, in February 2017, citing unspecified threats. In August 2017, Babchenko moved to Kiev.

The Russian journalist is known as the author of several books on military themes, which have been translated into 16 languages.

Babchenko’s murder marked the second killing of a prominent journalist in Kiev in less than two years.

In July 2016, Pavel Sheremet, who was working for the online investigative newspaper Ukrainska Pravda, was killed in a car explosion in the center of the Ukrainian capital.

Mexico too reported the murder of a journalist on Tuesday. Police have launched an investigation after Daily Excelsior correspondent Hector Gonzalez was found dead in Tamaulipas. He was allegedly beaten to death.

According to the police, they are trying to find the motive and the perpetrator, Efe reported.

The incident comes a week after a female journalist was murdered in Mexico. On May 24, Alicia Diaz, 52, was found dead at her home in Nuevo Leon. She had receiving a blow in the head. An investigation into her murder is under way.

According to a press freedom organisation, since the start of Mexican President Enrique Pena Nieto’s administration in 2012, as many as 42 journalists have been murdered, while nearly 2,000 attacks against journalists have been recorded.