Why did the hot chick have to die?

In the original ending Preacher died and Susan lived. However, test audiences loved Preacher and hated Susan, who was essentially responsible for the whole thing. So they went back and re-shoot the ending with Susan being killed. I think it's a better ending this way. It's more surprising and Susan would have gone to prison either way.

This petition was started asking WB to release the original ending where Susan lives (please sign it). Dunno why it wasn't an option to view in the deleted scenes:

https://www.change.org/p/warner-brothers-deep-blue-sea-s-original-ending-has-to-be-released

And do you know where I can find the script?

Exactly what I was going to say; she was the one person in the group of Smart-Shark-Chow who really hadd it coming.

I'm a lead farmer, mothaf*^%a!

She died b/c she was a b*tch! Plain & simple...

It's a fairly common trope in movies.
Most zombie movies does it, the scientists who create the zombie virus are normally some of the first to be eaten.
"Aliens" and "Aliens - Resurrection" did it too with Burke as proxy to W-Y corp and basicly every scientist on the spacestation in ressurection.

http://tvtropes.org/pmwiki/pmwiki.php/Main/KarmicDeath
or possibly
http://tvtropes.org/pmwiki/pmwiki.php/Main/HoistByHisOwnPetard

Light travels faster than sound,
that's why people seem bright,
until you hear them.

Except she wasn't trying to save her own skin like the pilot in Pitch Black, she was trying to save millions of lives by finding a cure for a deadly and heartbreaking disease. She wasn't some a hole who was ignoring the warnings of experts (because no one could predict sharks to flood an entire facility).

She didn't realize the sharks would gain human like intelligence until it was too late. It was a mistake. A costly one but it wasn't deliberate and that's the key. Humans make mistakes. I could understand it if she DELIBERATELY plotted to have the facility destroyed and members of her team offed for some nefarious reason but that wasn't the case.

Some of you guys are trashing her as if she was an arrogant and impenitent scientist like the dude from Deep Blue Sea 2. That guy had it coming. Susan was just a naive scientist trying to do the right thing.

Lucky shark. It got to eat her

No woman can be too thin.

Wasn't predictable? Bruh, the scientist behind the experiment almost always dies in these type of films. Not being predictable would been the creator killing her creation.

And explain how she was a "beach"? Everything that happened was an accident and her heart was in the right place. Nothing was intentional. She never once came off as a "beach" in the film and actually expressed remorse. No one and I mean no one could have predicted that bloody sharks would flood an entire facility.

And it made the entire third act complete trash. Carter had a thing for her, yet suddenly acted as if she never existed. And explain to me how Preacher is incapacitated from a shark bite one minute then seconds later, he miraculously jumps up and saves the day. And how did he figure out Carter's plan within seconds? He wasn't even within hearing distance when Carter and Susan devised the plan. It was so bloody dumb and made me want to crap my pants.