i ve been reading so much about joan rivers. you kind of forget how hard she worked to get to where she is. always a funny woman. one quote that struck me is, my whole career has been one big rejection after another. going back and back and pushing against everyone and everything. she is a very funny woman. it is a friday, but a sad friday because of the loss of joan rivers. that is where we will begin this half hour, the loss of another hollywood luminary. after going into cardiac arrest last week, joan rivers has died at the age of 81. for five decades she reigned as the queen of caustic comedy. rising from the ranks of nightclubs to television to international fame. and now there s an investigation into her death. abc s mara schiavocampo begins our coverage. reporter: joan rivers only child daughter melissa broke the news of her mother s death. sharing that my mother s greatest joy in life was to make people laugh. although that is difficult to do right now, i know her fin