A prominent Russian journalist – who was also a prominent critic of Russian president Vladimir Putin – died Wednesday from injuries sustained during a mysterious attack six weeks ago in St. Petersburg.

Nikolai Andrushchenko’s death was reported by Russian media outlets that cited his lawyer and the editor-in-chief of the Novy Peterburg newspaper. State news agency RIA Novosti reported Andrushchenko, 73, had been in a medically induced coma since the March 9 attack.

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Andrushchenko's attackers have not been identified. The editor of RIA Novosti has linked the assault to articles in the newspaper about corruption in St. Petersburg.

Andrushchenko was a member of the St. Petersburg city council from 1990 until 1993. He was among the founders of Novy Peterburg, where he made a name for himself writing about human rights issues and crime.

He was jailed in 2007 for defamation -- but his colleagues said the court was punishing him for its news coverage giving a voice to the opposition, according to the Committee to Protect Journalists.

The Associated Press contributed to this report.