Yes, Fili and Kili do die in ‘The Hobbit.’ Their deaths occur during the Battle of the Five Armies, which is a crucial climax in the story.
Fili, the younger brother of Thorin Oakenshield, and Kili, the youngest of the dwarves, fight valiantly to defend their kin and allies. They face off against the invading orcs and trolls during the battle. Their demise is portrayed as a tragic moment, highlighting the themes of bravery and sacrifice that run throughout the story.
Both Fili and Kili are depicted as strong, courageous characters who are fiercely loyal to their family and friends. Their deaths not only symbolize the high cost of battle but also underscore the personal losses experienced by the characters involved. The impact of their sacrifice deeply affects Thorin and serves to add emotional weight to the conclusion of the tale.