Health officials are investigating whether there are any links in the cases of four California women — at least two in Los Angeles County — who have died since 2003 of massive infection after taking the so-called abortion pill, RU-486, and a follow-up drug. The state and federal probe follows an announcement last month by the Food and Drug Administration, after the June death of a Sherman Oaks woman, warning doctors and patients of the potential for serious bacterial infection under certain circumstances. At the heart of the inquiry in California are why and how the deadly infections developed and...