it is with great reluctance and disappointment that i announce my retirement from concert touring, he said. cutting short his 50th anniversary tour on doctor s orders after being diagnosed with parkinson s disease. sweet caroline reporter: the last time we saw him, bundled up on new year s, his hands were shaking slightly as he warmed up the crowd in times square, but otherwise, showed no signs he might be struggling himself. early symptoms of parkinson s include tremors, stiffness and potential speech difficulties. he ll continue to write and record. his music has helped plenty of others weather tough times. most famously in boston after the marathon bombing. sweet caroline good times never seemed so good reporter: tonight, diamond is thanking his fans, saying this