It is the latest in a series of deaths of allies of Vladimir Putin.
Vladimir Sungorkin, editor of pro-Kremlin tabloid Komsomolskaya Pravda, has died aged 68.
According to a report by the official Interfax news agency, the 68-year-old journalist suffered a stroke while on a business trip to Khabarovsk Territory in Russia’s Far East.
Komsomolskaya Pravda, however, posted a message on her Telegram account saying Sungorkin died “suddenly” after showing signs of “choking” during this week’s trip.
“Sungorkin died suddenly while on a trip to collect material for a book about the great pioneer of the Far East, Vladimir Arseniev,” he said.
Leonid Zakharov, who accompanied Sungorkin on the trip, wrote about his death in a Russian state newspaper: “It happened absolutely suddenly, nothing foreshadowed. We were in the village of Roshchino.
“We were driving, we were already on our way to Khabarovsk, we planned to get there in the evening today, and from there to Moscow. Everything was fine.”
After stopping for lunch, Zakharov said: “Vladimir started to suffocate. We took him out to breathe fresh air, he was already unconscious, in fact, we did heart massage, breathing artificial… nothing helps.”
The tabloid has been described as Putin’s “favorite newspaper” and was founded in 1925.
Kremlin spokesman Dmitry Peskov called Sungorkin’s death a “great loss” this week.
“Today is sad news, unfortunately Sungorkin passed away. We knew him very well,” he said.
Sungorkin’s death follows the mysterious deaths of a number of Putin’s allies earlier this month, including Russian Far Eastern and Arctic Development Corporation aviation director Ivan pechorin.