to wrap up their case, the defense brought up fred's family to talk about how happy the muellers had been. >> did you observe anything that led you to believe your folks were having difficulty in their marriage? >> reporter: leslie's mother, ginnie, again defended fred. >> i've always had a good relationship with fred. >> reporter: but the prosecution's ears perked up when she offered a new detail about her son-in-law. >> yeah, fred is very successful. he could sell anything. he's a wonderful salesman. >> reporter: in final statements, the prosecutor used those words against fred. >> what we learned about the defendant yesterday is he can sell anything. but he can't sell you the impossible. >> from our perspective, that's what he tried to do. is that he tried to sell the emergency responders, c.b.i., the sheriff's office and, quite frankly, these juries, tried to sell something -- a story that was just simply impossible. >> reporter: could this jury rise to the challenge and once and for all make sense of what happened at cottonwood creek? case. >> either you believe crazy story "a" o

"fred mueller believes he got away with murder." >> reporter: but sheriff bruce says fred mueller may have underestimated the hinsdale county sheriff's department. >> i think that was he -- what he thought. he was going to get some kind of bumbling buffoon to show up. and he was going to walk away on this. >> reporter: what do you say to someone who says, "you're a small-town sheriff who got tunnel vision, who focused on this rich outsider and just like a dog with a bone would not let go" >> well, i'd say they're wrong. and i've got thick skin. we did the right thing. >> reporter: they kept working and testing and poking around, not sure if it would ever amount to anything. to go forward, something needed to change, and it was about to. >>> coming up -- the sheriff makes his case to a new d.a. and everything changes. >> we were able to get 30 minutes of his time. he said let's go. >> and for the mueller kids, a shock. >> i was just like, why? oh, well, we can't tell you that. >> a new chapter opens but nothing in this case will go the way anyone thinks. my dentist said that i should u