Given the task definition and input, reply with output. In this task, you're given the title of a five-sentence story and the first four sentences. Your job is to write the last sentence of the story such that it seamlessly connects with the rest of the story.

Title: Ben's short career. Sentence 1: Ben is a star baseball player. Sentence 2: Ben is batting one game. Sentence 3: Ben is hit in the head by a fastball. Sentence 4: Ben is badly injured.
Ben retires from a head injury.