What really happened?
Here's how I went about my research:
In late May of 2005, I faxed a question about the ending to P3 producer Barry Bernardi, while he was working on the new Adam Sandler film "Click." On June 2, 2005, he responded with this statement: "A long time ago. I recall that Heather died before the re-shoot and that we used a double."
Here's Doug's article: