ABC News' Chief Medical Correspondent Dr. Jennifer Ashton is used to helping others, but now she's using a painful time in her own life to do it. In 2017, her ex-husband took his own life. Thoracic surgeon Dr. Robert Ashton jumped off New York's George Washington Bridge just 18 days after their divorce was finalized. A note left in his pocket read, "call my wife." Jennifer is sharing her story in a new book called "Life After Suicide."