Jocelyne and her twin sister were both all-state in ice hockey as teenagers. Together they played on the Peewee A Boys' team in 2001–02 team as twelve-year-olds, leading them to the North Dakota State Hockey championship. Afterwards they accepted a scholarship to Shattuck-St. Mary's School in Minnesota, the same school at which Sidney Crosby played. The Lamoureux sisters led the school to four state titles and three national championships. In her freshman year, she accumulated 102 points in 60 games. In the following season she had 137 points in 59 games to place second on the team in points and first in goals. In 2006–07 she ranked second on the team with 131 points, and tallied 107 points in 27 games as a senior.
University of Minnesota
As a freshman in 2008–09, she finished second on the team and fourth in the nation with 65 points. The Gophers appeared in the NCAA Women's Frozen Four. At season's end, she was earned All-WCHA First Team and All-WCHA Rookie Team honors.
In 2009 Jocelyne and her sister transferred from Minnesota to North Dakota. Their transfer to their home state was attributed to the fact that North Dakota hired Brian Idalski, a former coach at the USA Hockey Development Camps. On October 23, 2010, she had a hat trick and one assist against Minnesota State. In addition, one of her goals was the game-winning goal. The hat trick was the first by a North Dakota player since Cami Wooster in 2005.
USA Hockey
Her first exposure to USA Hockey was at the USA Hockey Player Development Camp. She ended up being a four-time USA Hockey Player Development Camp attendee. She was a two-time USA Hockey Women's National Festival participant and a member of the United States Women's Under-22 Select Team for the 2008 Under-22 Series. She led the team with two goals. Lamoureux also participated as a two-time member of the United States Women's Select Team for the Four Nations Cup. Along with her sister, she was a member of the United States Women's National Team for the 2009 International Ice Hockey FederationWorld Women's Championship that won the gold medal. Jocelyne and her sister Monique were the first set of twins ever to play women's ice hockey in the Olympics. Lamoureux was named to the roster for the 2010 Four Nations Cup. In the opening match of the 2012 IIHF World Women's Championships, Lamoureux scored three goals while assisting on three others in a 9–2 win over Canada. Her sister, Monique Lamoureux-Kolls, and Hilary Knight each scored twice.
Olympics
Jocelyne has been to the Olympics three times: in 2010, 2014, and 2018. Team USA won silver medals in 2010 and 2014 and a gold medal in 2018, all three tournaments skating against Canada. In the gold medal game of the 2018 Winter Olympics, Jocelyne scored the game-winning goal in the first extra round of the shootout after the preliminary five rounds, and 20 minutes of overtime, were not decisive. Goaltender Maddie Rooney then stopped Meghan Agosta to seal the gold medal for Team USA, their first in twenty years. Jocelyne's twin sister Monique had tied the game near the end of regulation. In Team USA's preliminary round match against the Olympic Athletes from Russia of the 2018 Olympics, she scored two goals six seconds apart, an Olympic record for shortest time between goals by anyone, men or women.
Her father, Jean-Pierre, was a backup goaltender at the University of North Dakota from 1979–83. Besides her twin sister, Lamoureux has four brothers. Jean-Philippe is a professional ice hockey goaltender. He led the Lincoln Stars to the Clark Cup as a teenager and played for Team USA in the 2004 Viking Cup. He was the 2008–09 Goalie of the Year in the ECHL. He also led the Alaska Aces to the 2009 Kelly Cup Finals Finals. Jacques was an All-America center in 2009 for Air Force Academy. In addition, he was a finalist for the Hobey Baker Award. Pierre-Paul played for the University of Manitoba and is a student-assistant coach for the North Dakota hockey team. Mario skated for Team USA at the 2006 Viking Cup and played four years for North Dakota. He was named team captain in 2012 and then entered the pro ranks. Her mother, Linda, competed in 20 marathons including the Boston Marathon.
