Los Angeles - Robert Downey Jr has written a heart warming tribute to his late mother.
The Iron Man star - whose mother Elsie Ann Downey passed away aged 80 earlier this week - took to Facebook to share the moving eulogy with his fans.
He wrote: "I wanna say something about her life, and a generic 'obit' won't suffice."
The heartfelt tribute detailed Elsie's early life, the breakdown of her marriage to Robert's father Robert Downey Sr and her subsequent battle with alcoholism.
The 49-year-old actor - who has also struggled with drug addiction and alcoholism in the past - confessed that it was in fact his mother who eventually helped him kick the habit.
Elsie - whose condition worsened after she suffered a cardiac arrest in March and was put on life support - passed away on Monday.
He ended the touching tribute with "Elsie Ann Downey. 1934-2014."