comes to light now while martinez was being questioned in connection with a 2006 double murder in ocalawo construction workers were shot and killed. but the whole thing, it was a cold case for years and years. but listen to this. a cigarette butt martinez apparently left behind led to the huge break in the case. it was inside this pickup truck where martinez says he shot and killed those two workers. authorities say a lab test showed martinez's dna on the cigarette butt. right now martinez is sitting inside of an alabama jail in connection with a homicide there. cnn's elena mocado joins me now with this crazy story. a lot of questions. first question, what prompted him, do we even know, to up and then confess to killing 30 people? >> brooke, according to the detective who spoke with him in alabama, jose martinez just wanted to come clean for all of the crimes he's committed. the double murder you mentioned happened in marion county more than six years ago. it wasn't until earlier this year that detectives got those lab results pointing to martinez as a suspect in that case. now, investi