Coyotes' general manager Don Maloney confirmed fan speculation by saying he acquired prospect Anthony Duclair from the New York Rangers in the hopes he would develop line chemistry with Domi. This was due to the fact that during the 2015 World Junior Ice Hockey Championship both Duclair and Domi showed visible chemistry and were key components in leading team Canada to gold. In his first NHL season, Domi developed instant line chemistry with Duclair, earning the duo the nickname "The Killer D's". Domi scored his first career assist and goal in his NHL debut against the Los Angeles Kings on October 9, 2015, against Jonathan Quick. On January 12, 2016, Domi recorded his first career NHL hat trick against the Edmonton Oilers. Two of his goals came on the powerplay, and defenceman Oliver Ekman-Larsson assisted on all three goals.
Montreal Canadiens
On June 15, 2018, Domi was traded to the Montreal Canadiens in exchange for Alex Galchenyuk. The following day, Domi signed a two-year, $6.3 million contract extension with Montreal. In a preseason game against the Florida Panthers on September 19, Domi sucker punched Panthers defenceman Aaron Ekblad, resulting in Domi's suspension for the remainder of the preseason. On October 3, 2018, Domi recorded two assists in the season opener as the Canadiens lost 3–2 in overtime to the Toronto Maple Leafs. On October 17, Domi scored his first goal for Montreal in a 3–2 victory over the St. Louis Blues. On November 10, Domi registered two assists against the Vegas Golden Knights, bringing his season tally to 21. He became the first Canadiens player during the season to surpass the 20-point mark. He ended the 2018–19 season with 72 points, making him the first player since Tomáš Plekanec in 2009–10 to score 70 points or more in a single season for the Canadiens.
Personal life
Domi was born in Winnipeg, Manitoba, when his father, Tie was a member of the original Winnipeg Jets franchise. Growing up, Domi's favourite team was the Toronto Maple Leafs, partially due to his father's many seasons with the club. Domi is of Albanian descent—his paternal grandparents immigrated to Canada during wars and tumult in Albania. Domi has Type 1 Diabetes which was diagnosed at age 12 following a hockey tournament in Detroit. He regulates his blood sugar levels using an insulin pump attached to his hip. During games, he excuses himself every 15 minutes to test his blood glucose level. Domi wore the number 16 during his time in Arizona in homage to Bobby Clarke, a famed hockey player who also suffered with the condition. He switched to number 13 after a trade to Montreal due to 16 being retired. Domi has a specially trained service dog, Orion, who will wake Max up if his blood sugar falls below a certain threshold at night.
International play
Domi represented Team Canada at the 2015 World Junior Ice Hockey Championship, winning gold. Domi later made his senior national debut with Canada at the 2016 World Championship.