Casey Johnson was an American heiress, socialite, and celebutante as well as an occasional actress, model, and author. She was the great-great-granddaughter of Robert Wood Johnson I. In 1999, Johnson had a minor role in the film Gloria, starring Sharon Stone. In 2002, she was featured in the documentary It Girls, which was filmed in 2000 during Manhattan'sFashion Week.
As a child, Johnson was diagnosed with diabetes. During her teens in the mid-to-late 1990s, Johnson received heavy attention from the paparazzi media as a New York "party girl" and socialite. At the age of 14, Johnson co-wrote a book with her father entitled Managing Your Child's Diabetes. She appeared as herself on the television shows The Fabulous Life of... and E! True Hollywood Story.
Johnson's mother revealed that her daughter struggled with borderline personality disorder. Johnson's mother attributed her daughter's troubles to the disorder