reporter: finally, it was time for andrea to tell her story to a jury. as well as i held myself, a part of me was nervous that i would have to, again, go through this traumatic incident that happened to me all over again. live through it again. yes. reporter: on the stand she recounted that night back in 2004 at cosby s home. when she finished, his defense team challenged her story, zeroing in on inconsistenices. on the sixth day of deliberating, the jury announced it was hopelessly deadlocked. today a pennsylania judge declared a mistrial. when you heard it was a hung jury, was that devastating? it didn t feel complete. it didn t feel like justice. it just felt empty. reporter: it could have ended right there. but the d.a. had a message for
cosby went on trial in a courthouse outside philadelphia for sexually assaulting andrea constand 13 years earlier. mr. cosby, are you confident today, sir? reporter: finally, it was time for andrea to tell her story to a jury. as well as i held myself, a part of me was nervous that i would have to, again, go through this traumatic incident that happened to me all over again. live through it again. yes. reporter: on the stand she recounted that night back in 2004 at cosby s home. when she finished, his defense team challenged her story, zeroing in on inconsistenices. on the sixth day of deliberating, the jury announced it was hopelessly deadlocked. today a pennsylania judge declared a mistrial. when you heard it was a hung