her confession was a linchpin for the prosecution's case. then the investigation took a stunning turn. there's andrea canning with the conclusion of "evil was waiting". >> prosecutor lynn pryor already felt she had a solid case against jarred long. and after his arrest, police found even more evidence in his truck. >> there was one spot of blood that belonged to vincent goslyn on the backpack of jarred long. >> this is bingo right here. >> this is more evidence than most of the murder cases i've prosecuted. >> how do you explain the victims blood on your backpack when you are hundreds of miles away? >> you can't. unless you're the person that killed him. >> but pryor knew the case against jessie was in as airtight. >> it was very much a circumstantial case because there was no physical evidence implicating her. >> did you worry that wouldn't be enough to get a conviction? >> somewhat. yes. jarred long was not willing to give anything to help out with implicating jessie. but we knew that it was her