The apparent suicide of Russia’s transportation minister brought expressions of shock and sorrow from the Kremlin but no new clues as to why Roman Starovoit might have taken his own life amid media speculation he potentially was facing corruption charges.

Former Russian Transport Minister Roman Starovoit died by suicide on Monday, just hours after Russian President Vladimir Putin fired him from the job, officials said.

Roman Starovoit was Russia’s transport minister until President Vladimir Putin fired him from the position on Monday. Just hours later, he was found dead in his car, with investigators saying that suicide is the most likely cause.