Russia ? A military correspondent for Russia’s top business daily died after falling from a fifth-story window, and some media speculated Monday that he might have been killed for his critical reporting.

Ivan Safronov, the military affairs writer for Kommersant, died Friday in the fall from a window in the stairwell of his apartment building in Moscow, according to officials. His body was found by neighbors.

Safronov, who had served as a colonel in the Russian Space Forces before joining Kommersant in 1997, frequently angered authorities with his critical reporting and was repeatedly questioned by the Federal Security Service, the main KGB successor agency, which suspected him of divulging state secrets. No charges were ever filed because Safronov was able to prove his reports were based on open sources, Kommersant said.

With prosecutors investigating the death, Kommersant and some other media suggested foul play. “The suicide theory has become dominant in the investigation, but all those who knew Ivan Safronov categorically reject it,” Kommersant wrote in an article Monday.