Lewis was born on January 8, 1987, in Salt Lake City, Utah,[1] to Canadian parents Randy and Linda.

[3] Due to the low popularity of ice hockey in Salt Lake, Lewis often played on youth teams with only 12 players.

As a freshman in 2002, Lewis was the Brighton Bengals leading goal scorer and helped the team qualify for the State championships.

[6] At the age of 16, Lewis was drafted by Cedar Rapids RoughRiders of the United States Hockey League (USHL) but failed to make the team.

However, before the season started, Lewis was offered the chance to play with the Des Moines Buccaneers in the USHL and he immediately moved to join the team.

[12][13] Although he had originally committed to play college hockey at the University of Michigan, Lewis chose to forgo post-secondary education and start his career by signing a three-year, entry-level contract with the Kings.

[17][18] While the WHL tried to dispute this signing[17][19] the Canadian Hockey League's board of governors ruled in favor of Owen Sound.

[3] After the Owen Sound Attack were eliminated from the 2007 OHL playoffs, Lewis signed an amateur tryout agreement with the Kings' American Hockey League (AHL) affiliate, the Manchester Monarchs, to end the season.

[28] In the first year of his new contract, Lewis helped the Kings win their first Stanley Cup championship in franchise history.

[32] In the 2016–17 season, Lewis scored 12 goals and assists for 24 points and played a full 82 games for the first time in his career.

[34] After appearing in 17 games for the Kings during the 2018–19 season, and recording three points, Lewis was again placed on injured reserve due to a lower-body injury.

[38] On July 28, 2021, Lewis signed a one-year, $800,000 contract with the Calgary Flames, reuniting him with former Kings head coach Darryl Sutter.

[40] After playing a full 82-game season for a second consecutive year, Lewis signed a one-year, $800,000 extension on July 1, 2024.