Onassis began receiving chemotherapy in January of 1994. She publicly disclosed her diagnosis, saying initially that the prognosis looked good. She even continued to work as an editor at Doubleday. But by March her cancer had spread to her spinal cord and brain. When the cancer spread to her liver in May of 1994, doctors deemed her condition terminal. As “America’s Widow” depicts, Onassis decided to leave New York Hospital of her own volition on May 18, choosing to spend her remaining time at her Upper East Side home. The next evening, at 10:15 p.m., Jackie O died in her sleep with her children by her side. Love Story’s third episode eschews the fox-hunt accident, instead choosing to portray Jackie’s deteriorating condition at home. An early scene finds Watts as Onassis sitting by her lit fireplace, going through her old letters, rereading each one and then tossing them into the fire. “I don’t need my personal correspondence memorialized in The Smithsonian,” she says when Kelly’s John asks her why she is destroying her keepsakes. According …