. >> his next stop was bridgette's house. >> police told you, right away they thought it was probablyut her nose stone, she does not have pierced ears, i asked if they could tell if they were pierced ears, and the scar on her angle. and they said with the elements, they were not able to tell. so we had to wait for dna. >> the next day, after an all nighter by the crime lab, police made it official. >> an autopsy today has determined that the remains of that female discovered in the field, are those of 19-year-old brianna denison. the official cause and manner of death was strangulation. it was a sexually motivated crime. >> all i can say to that is at least i am not waiting, four years later, wondering. that is about the only positive i can get out of it. >> back at that field, detectives found something that looked like the killer's calling card. >> they were two sets of panties that were on her right side, tucked underneath the right side. >> thong underwear, one pink and one black, with an image of the pink panther cartoon character. crime lab technicians tested everything and dete

her 2 positive 66 women with advanced stage breast cancer were treated with the vaccine, including bridgettegoing home to die, she reached out to get into the vaccine trial and now, more than a decade later. >> cancers are leaving and they're going away they're disappearing. >> your cancer is disappearing >> yeah. >> reporter: she does get additional treatment, but she credits the vaccine for an extra decade of life with her family including a recent highlight, singing the national anthem at the seahawks/cowboys game. ♪ oh say can you see ♪ >> reporter: of the trial participants who got the ideal vaccine dose, 80% were still alive at the 10-year mark. the median survival rate for stage 4 her 2 positive is only five years the team is now working on a cutting-edge breast cancer vaccine that attacks cancer stem cells. >> the pieces are there. and the understanding of the immune system is there what we really need is to be able to evaluate these vaccines in a very uniform manner with a lot of eyes looking at the data coming out of these trials. >> reporter: enter michelle young, a stage 4 surviv