>> reporter: sam and his wife had also separated by this point. she was at work when her sister called her and told her police had once again come for sam. >> what'd you think when you heard sam was arrested? >> the same that i always had. like, here we go again. >> nothing to it, and he'll be out soon. >> yeah. >> reporter: after all, they'd detained sam once before and had to release him. but as daron wyatt now explained to sam lopez, this time was different. >> "i've told you before that we wouldn't give up until -- until we were able to bring resolution to this case, and that's where we're at now." >> reporter: but just when it seemed the case was buttoned up, daron got a surprising call. remember the request for touch-dna daron had submitted months earlier? the crime lab finally called back. and the crime lab says what? >> "hey, did we tell you that we found javier's dna on cathy's body?"