dylan is a people pleaser. i know my boys. they're drug addicts. they're not murderers. >> reporter: but grand jury says that's exactly what they are. zack adamsndicted for murder. >> decatur county grand jury handed down indictment of especially aggravated kidnapping and first degree felony murder. >> reporter: recognizing dylan's weakness as a witness, authorities turn to shayne austin. he's not charged. instead they offer him immunity in exchange for testimony. but he says he can't answer the most important question. where's holly? >> we still didn't have her back so for me, even then, i think there was a part of me that still didn't believe it. that all changed on september 7th 2014. a sunday, when two ginseng hunters find partial human remains including a skull at the foot of a cell phone tower in this wooded area off interstate 40. the very area where holly's phone had been pinging. and just six miles from zach adams's house. >> confirmed they found bobo's remains. >> reporter: where were you when you got word? >> we were at the mall in jackson, tennessee. and i will never forget that. i once again got that same, it's her feeling. just h

adams. his brother dylan and another man. jane austen by the way, here is another one. is no longer in the mix. why wouldn't he go to trial with testimony like that? >> another reason you have to look at his credibility, he's cut a deal, the deal has not been disclosed. we know he is just trying to save his own hide, that witness has had his credibility destroyed. >> julie: he basically said he helped bury a body, how do you not get a trial? what kind of deal do you strike with somebody who admitted to burying a body after somebody killed an innocent young girl? how does a judge make a deal like that? >> he's cut a deal, , and overarching deal. >> unfortunately you have to make a deal because as i understand it, the reason the government is not going to go forward with this deal is because he ultimately lied it to them. when we may deal with these guys, part of the deal is if you lie the deal is off the table and we can go forward. then the defense comes in and says the government has to live up to its promise. this is a tough case for the government, don't kid yourself