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A somber Michelle Williams was back to work today not 48 hours attending the funeral of her ex-fiancé, Heath Ledger, in Australia.

The courageous 27-year-old was on the SoHo set of her upcoming film Mammoth, just three blocks from the Broome Street loft where her 2-year-old daughter Matilda’s father died of an accidental prescription drug overdose three weeks ago.

Shy and serious, Michelle was filming inside a macabre setting, especially for her first day back at work: the Evolution store on Spring Street, which sells exotic bones.

Just before his death, Heath had told friends in Australia how much he missed Matilda, who was in Sweden with Michelle in January. The sad truth is that he would have been reunited with her this month, because Michelle was due back in NYC for filming.