his attorney, jennifer thompson, calls a cell phone expert.though zach adams' phone may have been in the same place as holly bobo's at times on the day of the crime, at other times that day, zach and holly's phones were far apart. >> at 8:17, holly's phone is over in this area. and at 8:16, zach adams' phone is over here, and they're miles apart, okay? >> reporter: but it's not just about creating reasonable doubt -- thompson is shooting for reasonable certainty that the real killer was someone else. for assistance she turns to terry dicus -- the former lead investigator removed from the case because of unwavering belief that his old nemesis terry britt is the predator who murdered holly. >> in your opinion, what is the strongest evidence implicating terry britt? >> he's the kidnap and rapist in decatur county. he's the one that would be willin' to do this. >> reporter: aside from his notorious rap sheet, you'll recall that britt had a wafer-thin alibi, and the cadaver dogs alerted on his car. >> who has human decomposition on two of their car