say a spark ignited. >> reporter: no surprise, it felt pretty good. after rehab, joe caught a break, and started performing on broadway. but the thing about heroin, is that the possibility of a relapse was always waiting for him there in the wings. >> i managed to stay clean for a year and a half. amazing my life changed and i was performing on broadway, and i could not believe it. a heroin addict and performing on broadway. >> but it is another visit to the dentist, and another prescron, and this time for vicodin, and then -- >> i took it as prescribed and within four hours i was shooting heroin. >> four hours? >> yep. and on broadway. >> you were clean for a year and a half and performing on broadway, and you get an fda-approved medication from a do doctor and within four hours -- >> yeah, it woke up something ancient in me.