In the late 1980s, LeMay became known for his role in the cult horror TV series Friday the 13th: The Series as Ryan Dallion from 1987-1989. In 1993, he went on to play Steven Freeman in Jason Goes to Hell: The Final Friday.
LeMay was born in Saint Paul, Minnesota and moved to Normal, Illinois in his teens. He went to Normal Community High School and participated in school plays and got into both singing and acting. LeMay went to Illinois State University and got a Bachelor of Science degree and completed a double major in music and musical theatre. He moved to Los Angeles in 1985 to star on TV. He appeared on hit TV shows like The Facts of Life.
In recent years John has returned to his musical theater roots starring in a regional production of Legally Blonde in 2014.