Williams wrapping herself in work after Ledger's death

Melbourne, Feb 26 : Despite the tragedy she has faced, Michelle Williams knows that the show must go on, and so after Heath Ledger's death she has thrown herself into work.

After flying to Perth for Ledger's funeral, Williams with her and Ledger's two-year-old daughter Matilda returned to New York, where she is shooting for the film 'Mammoth'.

Her father, sharemarket guru Larry Williams, said that she was focusing on her work.

"She's wrapped herself up in that and is really focused on that," The Daily Telegraph quoted him, as saying.

Ledger was found dead in his New York apartment on 22 January. He was 28.

Toxicology results revealed that he was killed by an accidental overdose of prescribed medications.

ANI