Jay's first major speaking role was as Seminole local John Oscelo in Key Largo (1948), with co-stars Humphrey Bogart, Lauren Bacall, and Edward G. Robinson.
The Screen Actors' Guild has Jay's birthday erroneously listed as May 26, 1919, when both family and US Government records show he was indeed born on May 26, 1912.
Jay took his stage name of Silverheels from his track days as a youth, when, wearing white shoes, he ran so fast his feet appeared to be streaks of white. Since he thought it would be awkward for a Native American to have the name of Whiteheels, he chose Silver instead.