In an interview in the October 2011 issue of Vogue, the 31-year-old actress said experiencing the loss of Ledger has changed her daily interactions, career and how she acts as a parent and friend.
She said she now looks at life through a "lens" in which everything is "impermanent."
Ledger, 28, died in January 2008 after an accidental overdose of prescription drugs. In addition to Williams, he left behind a five-year-old daughter, Matilda Rose Ledger.
Via http://m.nypost.com/p/news/local/actress_michelle_williams_says_heath_rjS5wxeYGdF1jIZZGGLRtI