A moon crashed onto him.
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Beth Wooke goes by Chewie.
Alexander Buder goes by Chewie, and Buder.
Chewbacca was attempting to free Wookies being sold as slaves to an Imperial commander. When the Imperial found that Chewbacca successfully freed the slaves, he sent Imperial TIE Fighters lead by Lieutenant Han Solo to attack Chebacca's ship. Chewie was knocked unconcious in the process, but when Solo was ordered to kill him, he refused, arguing that the Wookie would be a useful slave. Chewie was rigorously worked by the Imperial commander, and was whipped frequently. Solo realized the cruelty of this and helped Chewbacca escape. The two then became smugglers and traveled the galaxy together until Chewie's death.
I don't know if "scared" is the right word. She was probably worried about what was going to happen to her as well as about what was going to happen to Luke, Han, and Chewie. But she wasn't scared in the sense of being frightened.
25 years after the events of "A New Hope," during a mission to Sernpidal, a moon collided with the planet and since Han Solo's son, Anakin Solo, was unable to rescue Chewbacca in time before escaping the moon's path, Chewbacca was crushed to death along with several inhabitants who couldn't escape