so no one notice at first when inland, a little, in a town called pembroke pines, where donna velazquez, just three months a detective. a rookie, really. had just been assigned to a brand-new cold case unit. >> the sergeant came into the office and dropped a box of papers right on my desk and said, here, see what you can do with this. i began to wonder, is this a test to see could she really do this? >> the case was a challenge was an understatement. now all but forgotten mystery, the disappearance 15 years earlier of a young man named david jackson. in the file, offered no hints, no pointers. nothing, really. beyond the basic value. to unearth the truth, even the rookie cop knew she would have to learn about the victim. so, she began with something easy. she found david jackson's mother, judy carlson. how do the sun, actually, who called his mom. >> he said are you sitting. i said yes. he said that if they're reopening david's case. >> the detective and the mother talked about david for hours. wasn't a problem for duty. she loves talking about her boy. even now, to us. >> david was my