immediately suspected his former girlfriend, jodi arias. graphic evidence found at the scene pointed to jodi as well. and soon she was arrested. her trial captivated the nation with months of lurid testimony. through it all there was a fascinating mystery at the heart of the crime. who was jodi arias? here's josh mankiewicz with "along came jodi. " >> mr. alexander was dead. you worried about that, right? >> yes. >> it would be you that did it, correct? >> yes. >> the jodi arias trial never played as a murder mystery. jodi, after all, had admitted to 12 jurors in open court and a few million viewers on tv, that she was the one who shot, stabbed, and then stabbed some