Image Credit: Getty Images Brad Arnold, the lead singer of 3 Doors Down, announced he had been diagnosed with stage 4 kidney cancer less than a year before he died. The late 47-year-old rocker shared the news with fans while revealing that the band's upcoming summer tour had been canceled as he focuses on his health. Learn more about the form of cancer that Arnold was battling here. Who Is Brad Arnold? Arnold was the lead vocalist and a founding member of the American rock band 3 Doors Down. Born on September 27, 1978, in Escatawpa, Mississippi, Arnold co-founded the band in 1996.