cell -- a suicide. >> a million questions for elisa and now that door has been slammed shut. >> reporter: and now sarah left holding the bag, would face murder charges alone. coming up. >> when you try only one defendant, it's very easy, as it was for sarah dutra to point the finger at one who who is not there. >> when "dateline" continues. there. >> when "dateline" continues you'll ask... what pain? with advil liqui-gels. ♪ protect your pet with the #1 name in flea and tick protection. frontline plus. trusted by vets for nearly 20 years.