The severity of Kennedy's illness was not publicly detailed, but it was known within New York society. As his condition showed slight improvement, Grace Kelly reached out to Jackie Kennedy, suggesting she visit the hospital. Jackie appreciated the gesture and invited Grace to come dressed as a nurse, joking about Jack's preference for more attractive nurses.

When Grace arrived, she saw Kennedy surrounded by busy attendants, looking extremely frail and pale. Despite being only thirty-seven, he appeared much older and totally unlike his usual energetic media image. Kennedy's condition was clearly serious, emphasizing the toll his illness was taking on him physically.