In 1963, Valentine joined the World Wide Wrestling Federation (WWWF). While there, he had one reign with what was then known as the WWWF United States Tag Team Championship, as he teamed with Tony Parisi to hold the belts for seven months in 1966. Valentine later turned on Parisi, however. This ignited a brief feud with Bruno Sammartino, who was billed as Parisi's cousin.
On April 24, 2001, Valentine passed away.