The 27-year-old extra and Ledger became a brace during filming of 2005's "Brokeback," in which they costarred as bedmate and wife.
They after acclimatized in New York, and had a daughter, Matilda, built-in October 2005.
"Please account our charge to ache privately," Williams said in a statement. "My affection is broken. I am the mother of the best tender-hearted, high-spirited, admirable little babe who is the spitting angel of her father. All that I can adhere to is his attendance central her that reveals itself every day."
Ledger, 28, died in his Manhattan accommodation January 22. Authorities doubtable a accessible biologic overdose, but the account of his afterlife is still awaiting the aftereffect of toxicology tests.
Police said several decree drugs were begin in the Manhattan accommodation area the actor's anatomy was found.
"His ancestors and I watch Matilda as she whispers to trees, hugs animals, and takes accomplish two at a time, and we apperceive that he is with us still," Williams said. "She will be brought up in the best memories of him."