Article continues below advertisementMary Richardson Kennedy gave her husband's private diaries to a friend before her death by suicide in 2012.Robert F. Kennedy Jr.'s late second wife - who was 52 when she ended her life - took them as "insurance" amid their contentious divorce proceedings, according to journalist Isabel Vincent's new book."She saw them as some kind of leverage," Isabel said in an interview published on Wednesday, April 8, ahead of the release of RFK Jr.: The Fall and Rise.