Because someone threw a piano at her!
So, Nate and Rob are walking through the forest one day. They come across this lever stuck into a rock, with a bronze plaque placed above it. The Bronze plaque read, "If this lever is pulled, the end of the world will occur!"
Rob, being the extreme pessimist of the two, wanted to steer as far away as they could from the lever. Nate, being the more curious, decided to go over and try to pull it. Rob said, "No! Don't pull it! If..if you pull it...I'm gonna shoot you!"
But Nate tried to pull the lever, so Rob shot Nate.
The moral of the story is: Better Nate than Lever.