Lacasse attended many high schools. In order of attendance: École Secondaire Catholique Marie-Rivier in Kingston, Ontario, College Charles-Lemoyne in Ville Ste-Catherine Quebec, École secondaire de Mortagne in Boucherville Quebec, Kingston Collegial and Vocational Institute in Kingston, Ontario, Lake Forest Academy Chicago, and graduated from Marian High School Detroit. Thereafter, she enrolled at Providence College where she completed her first degree. Presently she is studying for a master in Marketing.
Playing career
Lacasse won a bronze medal with the Kingston Ice Wolves at the OWHA provincial championship in 2005. In 2007–08, Lacasse competed for Detroit Little Caesars, and won a silver medal at the 2008 USA Nationals.
Providence
On October 29, 2010, Lacasse stopped 40 shots in a 2–2 tie against No. 5 Boston University, including three in overtime. The goalie made several quality saves, including on a partial breakaway in the first period by Terrier Jenn Wakefield. She stopped 14 shots in the opening period and 13 in the third frame. During October 2010, Lacasse had a 1.64 GAA and a.949 save percentage. These numbers were complemented by two shutouts. In addition, she accumulated a league-high 281 saves. In two games, she had over 40 saves. For the week beginning January 14, 2011, Lacasse made a total of 86 saves in wins against No. 7 Boston College and No. 9 Northeastern. On January 19, she matched a career-best 51 stops against the Eagles at Schneider Arena. The Friars penalty kill was a perfect 7-for-7 during the two matches. On March 5, 2011, Lacasse would break the record set by Florence Schelling earlier in the day for most saves in a Hockey East tournament game with 58. On January 28 and 29, 2012, Lacasse stopped 51 of 53 shots in a Friars sweep of the Connecticut Huskies. With the two victories, Lacasse surpassed Jana Bugden as the Friars all-time wins leader with 59. Her shutout on January 28 was the 17ht of her Friars career, a new record. On Friday, February 17, 2012, Providence skated to a 0–0 tie against the #7 Northeastern Huskies. The Friars have clinched at least fourth-place in the Hockey East standings, with home ice advantage for quarterfinal play. Both goaltenders, Genevieve Lacasse of Providence and Florence Schelling of Northeastern stopped 80 shots combined through three periods and overtime. Lacasse stopped 42 shots while Schelling logged 38 stops. With the shutout, Lacasse earned the 18th of her NCAA career, a Providence school record. Following the 2012 Hockey East tournament, Lacasse was named to the All-Tournament Team after playing over 179 minutes of playoff hockey without allowing a goal. Upon graduation, Lacasse set Providence College recordsin four categories. Said categories included: victories, games, saves and shutouts.
Hockey Canada
Lacasse was named to Canada's 2014 Olympic roster. In the 2011 MLP Cup, Lacasse earned a shutout in a 5–0 defeat of Switzerland on January 4. Prior to the match, she had made 57 consecutive starts for the Friars. Lacasse earned a shutout in the gold medal game of the 2011 MLP Cup, as Canada prevailed over Sweden by a 6–0 mark. In the third game of the 2011 IIHF Eight Nations Tournament, Lacasse earned a shutout in an 11–0 triumph over Slovakia. By being named to the Team Canada roster for the 2012 IIHF Women's Worlds, Lacasse became the 19th skater from Providence to compete in the World Championships, while being the first to dress for Team Canada.
During the 2012–13 CWHL season, Lacasse was the regular season goaltending champion. For her efforts, she would win the CWHL Most Outstanding Goaltender Award. In the postseason, she would help the Boston Blades become the 2013 Clarkson Cup champions. On August 27, 2016, the Calgary Inferno acquired Lacasse from the Boston Blades, completing the trade that sent Tara Watchorn to the Blades in the summer of 2014.
