Project Runway contestant and fashion designer Mychael Knight died Tuesday in Atlanta, Ga. at the age of 39. The cause of death has not been revealed, but according to TMZ, Knight was recently checked into a hospital where he was getting treatment for intestinal issues. Knight appeared on Season 3 of "Project Runway," where he finished in fourth place. He later returned for Project Runway All-Stars. After his participation in the reality show, Knight launched a clothing label, a female/male lingerie label, and his own unisex fragrance.