he is awaiting trial. at number five the search for university of virginia student hannah graham. please, please, please help end this nightmare for all of us. reporter: the 18-year-old was spotted on surveillance video walking through charlottesville the night she disappeared. she is seen with a man walking behind her who police believe is jesse matthew. they arrested him in texas, charging him in her disappearance. he has also been quharnldcharge attempted murder in another case. hannah graham s remains were found in october, every parent s worst nightmare. at number four the death of comedian joan rivers. i could die any second. reporter: rivers joked about her own death the night before she went in for a endoscopy procedure at a new york city center in august. an investigation by the centers for medicare services showed physicians failed to identify deteriorating vital signs and
face the death penalty. he is awaiting trial. number five the search for university student hannah graham. please please help end this nightmare for all of us. reporter: the 18-year-old was spotted on surveillance video walking through charlottesville the night she disappeared. she is seen with a man walking behind her who police believe is jesse matthew. they arrested him in texas charging him in her disappearance. he has also been charged with attempted murder in another case. hannah graham s remains were found in october. every parent s worst nightmare. at number 4, the death of comedian joan rivers. i am 81 years old. i could die any second. reporter: rivers joked about her own death the night before shes when in for an endoscopy procedure at a new york city center in august. an investigation by the centers for medicare services showed physicians failed to identify deteriorating vital signs and