George Clooney has announced the death of his sister Adelia "Ada" Zeidler at age 65. Us Weekly can confirm that Clooney's older sibling died from cancer on Friday, December 19. "My sister, Ada, was my hero," he told People. "She faced down cancer with courage and humor. I've never met anyone so brave. [Clooney's wife] Amal and I will miss her terribly." An obituary for Zeidler clarified that she "died peacefully surrounded by the people she loved" at St. Elizabeth Healthcare in Edgewood, Kentucky.