In 1955, he appeared at the Brooklyn Paramount Theater in disc jockey Alan Freed's first rock and roll show.
He landed a role in the World War II series The Gallant Men, in which he played ladies' man PFC Pete D'Angelo, and occasionally sang.
[5] Although he never won another regular role in a television series, Fontaine made many guest appearances on shows such as 77 Sunset Strip, Baretta, Happy Days, The Rockford Files (as a different character in four episodes) and Quincy.
According to police documents, in 1983, he approached a country singer with the promise of a recording contract with RCA and a large sum of money if the man were to kill his estranged wife, with whom he was engaged in a custody battle.
Fontaine successfully appealed his murder-for-hire conviction based on the trial judge's rulings concerning these earlier offenses.