Demers made his NHL debut on October 1, 2009, against the Colorado Avalanche after surviving the final cut in the San Jose Sharks training camp for the 2009–10 season.[2] He scored his first career NHL point in the second game of the season on October 3 against the Anaheim Ducks, earning the primary assist on Benn Ferriero goal, the first of his career.[3] Demers himself scored his first career NHL goal on November 15 against Cristobal Huet of the Chicago Blackhawks.[citation needed]
Demers' first multi-goal game came later in the season, on January 30, 2010, where he scored two power-play goals against Josh Harding of the Minnesota Wild. Demers scored his first career Stanley Cup playoff goal against the Chicago Blackhawks on May 16 in the Western Conference Finals, a series the Sharks lost in a four-game sweep.[citation needed]
On March 28, 2013, in a 2–0 victory against the Detroit Red Wings, Demers suffered a head injury after suffering a hit from Cory Emmerton; he was replaced on defence by forward Brent Burns for the Sharks' next game, which was against the Phoenix Coyotes on March 30.[4]
Dallas Stars
On November 21, 2014, just over one month into the 2014–15 season, Demers was traded to the Dallas Stars, along with a third-round pick, in exchange for defenceman Brenden Dillon.[5]
Florida Panthers
On July 2, 2016, Demers left the Stars organization as a free agent and signed a five-year deal worth $22.5 million with the Florida Panthers.[6] In his lone season with the club, Demers recorded 9 goals and 28 points in 81 games.[citation needed]
Following his fourth season within the Coyotes organization and having played 12 years in the NHL, Demers entered the 2021–22 season as an unsigned free agent. On December 20, 2021, Demers opted to continue his career abroad, agreeing to a one-year contract for the remainder of the season with Russian club Ak Bars Kazan of the KHL.[8]
Edmonton Oilers
As a free agent after his contract with Ak Bars, Demers went un-signed over the summer. With aspirations to resume his career in the NHL, Demers accepted an invitation to join the Edmonton Oilers training camp and pre-season in preparation for the 2022–23 season. Remaining with the Oilers through the entire pre-season, Demers was released from his tryout from the Oilers, however joined the Oilers' AHL affiliate, the Bakersfield Condors, on a professional tryout on October 11, 2022.[9] Registering 9 assists through 23 games with the Condors, Demers secured a one-year, two-way contract with the Edmonton Oilers on December 18, 2022.[10] On April 6, 2023, with Oilers' blueline depleted, Demers was called up to the NHL and played in a solitary game, marking his 700th career game.
Demers first played for Team Canada during the NHL Lockout at the 2013 Spengler Cup. Demers was added to Team Canada for his first IIHF-sanctioned tournament at the 2017 World Championships in Germany/France.[11] In 10 games, Demers went scoreless as Canada suffered a 2-1 shootout defeat in the final against Sweden on May 21, 2017, to finish with the Silver Medal.
Demers was born in Dorval, Quebec, the son of Guylaine and Darrell Demers.[15] In the 2010s, he discovered that he has Jewish ancestry on his father's side; upon his realization, Demers stated, "[Being Jewish] is on my father’s side of the family tree. It all came as a little bit of a surprise, but we welcomed it... Obviously, having that new-found heritage makes me curious."[16][17][18][19][20]