Michelle Williams discusses Heath Ledger's death

In a "Nightline" interview, Michelle Williams tells Cynthia McFadden that she still can't find greater meaning in ex-boyfriend Heath Ledger's death. She also says she misses the time period that followed Ledger's death because, for her, it was a year of magical thinking.

"It didn't seem unlikely to me that he could walk through a door, or could appear behind a bush. It was a year of very magical thinking," she says. "In some ways, I'm sad to be moving farther and farther away from it."

The portion where she addresses the loss of Ledger -- the first time she has done so in a TV interview -- starts around the 5:14 mark.