investigation. ♪ ♪ ♪ nancy: welcome back, i am nancy grace. this is the gabby petito special investigation, joining me, an all-star panel to make sense of what we know how, and last hours to air, a body has been found in the tetons. we believe with law enforcement that search for gabby is over. this is gabby. straight out to joe scott morgan, professor of forensics, death investigator, logged over 10,000 death cases. joe scott, i want to know, is she clothed? not clothed, can we get cause of death, depending on how long she is out there. can i tell how long she has been dead. we start with that, if so, how. >> yes. and let's keep in mind, when