MOSCOW, January 17 (RIA Novosti) - A man Russian authorities wanted to question in connection with an opposition rally in Moscow that turned violent committed suicide in a refugee center in the Netherlands, his lawyer said Thursday.

Alexander Dolmatov was denied political asylum in the country in 2012 and appealed the denial in court, his lawyer Yevgeny Arkhipov said.

The appeal hearing was due to take place within the next several days, he added.

The reason for the suicide was not known, he said.

Over 400 people were arrested and scores injured on May 6, 2012, when protesters briefly broke through police lines in a bid to take the protest to the Kremlin walls.

In November, a Moscow court gave a 4½-year prison sentence to Maxim Luzyanin for “the use of violence against public officials” during the protest that took place on the Bolotnaya Square on the eve of Vladimir Putin's inauguration for a third presidential term.

More than a dozen other defendants in the so-called Bolotnaya case maintained their innocence. They can face up to ten years behind bars if found guilty.

Update: An earlier version of the story cited Arkhipov as saying that Dolmatov died in Amsterdam. It was later determined that Dolmatov committed suicide in Rotterdam.