Robert F. Kennedy Jr. is accused of bullying his late second wife, Mary Richardson, in a new biography about the Secretary of Health and Human Services. Richardson died by suicide at age 52 in May 2012, two years after Kennedy, 72, filed for divorce. The couple shared four children: Conor, 31, Kyra, 30, William, 28, and Aidan, 24. In her new book, RFK, Jr.: The Fall and Rise, investigative journalist Isabel Vincent paints a bleak picture of Kennedy's second marriage, per an excerpt published by People on Tuesday, April 7.