Paul Karason, sometimes known as "Papa Smurf" (he didn't appreciate that nickname very much) passed away yesterday after he was admitted to the hospital because he had a heart attack. He also had pneumonia and suffered a stroke, which likely contributed to his death.
Mr. Karason came to fame in 2008, when he appeared on TODAY (don't click on that link unless you're prepared to read terrible color-based puns) to discuss his condition, known as argyria. Mr. Karason started taking silver preparations to treat dermatitis on his face. Silver has antibacterial qualities and has been historically used to fight infections, falling out of common use when penicillin was developed in the 1930s.