From an article at the BBC:

A Russian investigative journalist who wrote about the deaths of mercenaries in Syria has died in hospital after falling from his fifth-floor flat. Maxim Borodin was found badly injured by neighbours in Yekaterinburg and taken to hospital, where he later died.

Local officials said no suicide note was found but the incident was unlikely to be of a criminal nature. However, a friend revealed Borodin had said his flat had been surrounded by security men a day earlier.

Read more at the BBC.