Joshua Valentine worked with the TV personality on NBC s Running Wild With Bear Grylls.
The show stars famed outdoorsman Grylls, 46, roughing it in remote locations with celebrities including Don Cheadle, actor Terry Cruz, and tennis ace Roger Federer.
But the 37-year-old American was killed on Friday when he overtook a slowing truck on his Harley-Davidson and collided with a car on Route 46 in America.
New Jersey State Police say he was thrown from his bike after he overtook the truck and smahed into a Nissan car turning right into a truck stop.
Bear Grylls, 46, (pictured left) has paid an emotional tribute to his one in a million friend Joshua Valentine (pictured right) after the wildnerness guide died on Friday