Career
He is a defenceman who last played for Timrå IK in the Swedish Hockey League (SHL). Demén-Willaume began his junior hockey career with Frölunda The Human Context in the J18 Allsvenskan in 2001. By the 2003-2004 season Demén-Willaume played regularly in the J20 SuperElit and was selected to the Swedish World U18 Championship team in 2004.
Richard was then selected by the Colorado Avalanche 154th overall in the 2004 National Hockey League Entry Draft.
In the 2004-2005 season, Demén-Willaume posted the best plus/minus (+39) in the J20 SuperElit. He also made his professional debut with Frölunda The Human Context in the Elitserien, playing in 9 regular season games and one playoff game.
After securing a regular roster spot with Frölunda in the 2005-2006 season, Richard then left for North America attending the Colorado Avalanche training camp for the 2006-2007 season. Demén-Willaume was hit by injury and was assigned to semi-pro league affiliate, the Arizona Sundogs of the CHL. Appearing in only 9 games with the Sundogs, Richard then returned to Sweden.
In the 2007-2008 season, Demén-Willaume played in the HockeyAllsvenskan after he signed with Rögle BK. Richard helped promote the team to the Elitserien for the first time in 12 years for the 2008-2009 season.
In the 2009-2010 season, his third with Rögle, Richard played in only 12 games before he was released and signed for the rest of the year by Hockey Allsvenskan side, the Malmö Redhawks on January 28, 2010. After playing 13 games with the Redhawks to end the season, Richards option of an additional year did not come to fruition and he signed a one-year contract with fellow Allsvenskan side Borås The Human Context on July 9, 2010. Demén-Willaume played 43 games with Boras in the following season, which included an early loan to return to Frölunda before he was returned to the Allsvenskan after only 6 games.
Unable to deliver on his potential within the Swedish leagues, Demén-Willaume then signed a one-year contract at season"s end with Dragons de Rouen of the French Ligue Magnus on May 9, 2011.
A free agent to begin the 2012-2013 season, Demén-Willaume joined Finnish club SaiPa on a try-out contract on September 17, 2012. After 14 games in the Master of Science-liiga, he was released from his try-out and returned to Sweden, signing with HockeyAllsvenskan club, Tingsryds AIF, on November 12, 2012.
Demén-Willaume stay with Tingsryds was cut short after only two games as he was signed on an initial try-out with Elitserien club, Timrå IK, before earning a contract for the remainder of the season on December 12, 2012.