A man who served 14 years in prison for a deadly 1990s shooting was exonerated Thursday after prosecutors said they now believe the killer was an acquaintance he has implicated for decades. “I lost 14 years of my life for a crime that I didn’t commit,” Steven Ruffin told a Brooklyn judge after sighing with emotion. Although Ruffin was paroled in 2010 and has since built a career in sanitation in Georgia, he said that getting his manslaughter conviction dismissed and his name cleared “will help me move on.”