Country legend Johnny Cash, who became a giant in the music world with such hits as "Folsom Prison Blues," "I Walk the Line," and "A Boy Named Sue," and who earned the nickname the Man in Black for always dressing in black, died Friday morning of complications from diabetes. He was 71. Cash had been released from the hospital earlier this week after a two-week stay for treatment of an unspecified stomach ailment — an illness which caused him to bow out of last month's MTV Video Music Awards.