Although Letourneau was selected in the Ontario Hockey League draft, he elected instead to play at the prep school level.[1] In the 2023–24 season, his second of two for St. Andrew's College, he scored 61 goals and a league-leading 127 points in 56 games at the U18 AAA level. He also appeared in two games for the Sioux Falls Stampede of the United States Hockey League.[2] He intended to return to Sioux Falls at the conclusion of the season with St. Andrew's, but was sidelined by a shoulder separation in the final game of the season. Originally committed to play a full season with the Stampede before joining Boston College in the fall of 2025,[1] he later changed his commitment to 2024 when a roster spot opened after Will Smith signed with the San Jose Sharks.[3][4] In June 2024, Letourneau was selected 25th overall in the first round of the 2024 NHL entry draft by the Boston Bruins.[5]
Personal life
In addition to hockey, Letourneau played basketball and varsity lacrosse in high school.[1]