we i used to talk a lot. >> in fact, what she felt deep in her heart neff did go away. >> i'll always love david. >> and l then it was june 25th, 1988. brother, mark, was flying into town to visit the family. david was tovi pick him up at t airport but when mark arrived he waited and waited. no w david. and mark jackson had a terrible feeling. >> no matter what he would have been there for me. i knew something was wrong. w i knew something bad happened. >> oh, yes, very bad. and as the rookie detective poked around deep in the past that something was reaching up some things are too important to do yourself. ♪ through the mud to tell her it's get customized security long neglected story. with 24/7 monitoring from xfinity home. awarded the best professionally installed system by cnet. >> the case was both cold and simple. easy. awesome. call, click or visit a store today. baffling but maybe nature in south florida could help the investigation. >> coming up. >> with the crazy weather and the water table that we have if he were ever buried anywhere