Joan & Melissa: Joan Knows Best Joan Rivers' autopsy results disclosed and cause of death finally revealed 10/17/2014 Joan Rivers' cause of death is no longer unknown. Read More RELATED NEWS Melissa Rivers settles malpractice lawsuit against outpatient clinic, learns mother Joan Rivers' last wordsJoan Rivers' personal belongings to be sold at auction in JuneMelissa Rivers remembers Joan Rivers through laughter with E! special on anniversary of her death TAGS: Joan Rivers Melissa Rivers