The Charlie's Angels star lost her battle with cancer on 25 June, 2009, and O'Neal took to his Twitter.com account on Tuesday (25Jun13) to remember the actress.
In a post, he writes, "I know my angel is with me today. Always."
O'Neal also shared a black and white image of the couple with followers on his Facebook.com page and added, "A fan found this photo and sent it to me...one of my favorites. makes me ache for my darling."
Fawcett passed away on the same day as Michael Jackson.