United Kingdom, Dec. 20 -- George Clooney's sister Adelia 'Ada' Zeidler has died at the age of 65.

The Jay Kelly actor's older sibling passed away on Friday (19.12.25) following a battle with cancer.

Clooney, 64, told People in a statement: "My sister, Ada, was my hero.

"She faced down cancer with courage and humour. I've never met anyone so brave. Amal and I will miss her terribly."

Ada's obituary revealed that she died "peacefully surrounded by the people she loved" at St. Elizabeth Healthcare in Edgewood, Kentucky.

It states: "A talented artist, she shared her skills as an elementary art teacher at Augusta Independent for several years.

"In high school, her academic achievements qualified her to be a National Merit Scholar. Her l...