Trevor Letowski spent 10 years coaching at the Junior level in the Ontario Hockey League. He made his coaching debut during the 2010-11 season in Sarnia, where he assumed the assistant coach position with the Sting. He also served as head coach and associate coach in Sarnia successively until 2015. He was eventually hired as an associate coach by the Windsor Spitfires for two seasons, winning the Memorial Cup in 2017. He took the helm of the Spitfires the following year and posted a 91-83-24 record in 198 regular season games over three seasons.

His great work in junior hockey did not go unnoticed and led to opportunities at the international level where Letowski represented Canada three times at the IIHF World Junior Championship in 2014, 2016, and 2018. He was selected to the coaching staff as an assistant for all three squads, where he contributed to a bronze medal in 2014 and was part of the gold medal-winning contingent alongside head coach Dominique Ducharme in 2018.   

Prior to making his coaching debut, Letowski suited up for nine seasons in the NHL between 1998 and 2008. He played 616 regular season games with the Phoenix Coyotes, Vancouver Canucks, Columbus Blue Jackets and the Carolina Hurricanes. During his time in the NHL, the centerman recorded 84 goals and 117 assists. He added one goal and three assists in 17 playoff contests. Letowski was a teammate of Canadiens assistant coach Luke Richardson between 2003 and 2006 in Columbus. His playing career was also marked by stints in the AHL at the start of his career, as well as in the Swiss Elite League during the 2005 lockout. He retired from professional hockey after two seasons in the KHL with Barys Astana. 

The Thunder Bay, ON native was a seventh-round (174th overall) selection of the Coyotes in the 1996 NHL Draft. Letowski turned pro after three seasons sporting the colors of Sarnia in the OHL, where he amassed 248 points (93 goals, 155 assists) in 187 games. His 34-game point streak during the 1996-97 campaign is still a franchise record to this day. He also competed in the World Junior Championship as a player in 1997 and won gold. He ended the tournament with three points, including two goals, in seven games.