TASK DEFINITION: In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
PROBLEM: when does lexi die in grey's anatomy

SOLUTION: the eighth-season finale

PROBLEM: who played bob in suite life of zack and cody

SOLUTION: Charlie Stewart

PROBLEM: who was the actor who played darth vader

SOLUTION:
David Charles Prowse