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Instantly, derek smyer had to be an adult. >> he dropped out of high school so that he could get a full-time job. even though he wasn't making much, he was still doing what he could to support that baby. >> that changes your life? >> it does change your life. and that forestalls a lot of your options? >> absolutely. but derek was a hard-working guy. >> reporter: in 2002, the year after crystal died, derek smyer had another daughter with the same woman. >> if i fall, all this footage is being deleted. >> reporter: for the most part, he wasn't a full-time dad but danielle says he was in his chil...

Because he wasn't guilty. during those ten years from 2001 to 2011, what's derek doing and how is he? does he seem like a guy with a cloud over his head? >> no. he seems like a man who's flourishing. >> reporter: derek's sister danielle was shocked by the arrest. she says the way she and derek grew up was a world away from people like c-styles and from crimes like murder. >> we played, we were into sports, we had two extremely active parents that were a part of all of our sports leagues that were taking us to summer camps. >> she says derek did go off track in high school. he was just 16 when ...