Alex Forrest (Glenn Close) doesn't try to kill Dan Gallagher (Michael Douglas).  No bathtub scene.  In the original version, she exacts her revenge in a different way.

Test audiences hated the original ending (shown below), so the cast was called back together to reshoot the ending as we now know it.

But here's how it originally went.  If you're a fan of the movie, and haven't seen this yet, it's an…. interesting… treat: