Lemieux played at West Valley High School as a tight end and offensive lineman.

[4] After his junior season, Lemieux and a group of teammates (including quarterback Justin Herbert) considered leaving for the NFL Draft, but collectively decided to stay.

[10] On Monday Night Football on November 2, he started his first game at left guard for Will Hernandez who tested positive for COVID-19.

Lemieux was the 2nd Giants offensive lineman to be announced out for the season, following Nick Gates' injury in Week 2's Thursday Night Football.

[16] He finished the season playing in 39 offensive snaps, Lemieux’s struggles continued, allowing five pressures and a sack.