Read the following context and answer the question.
Context: His mother now told me she had added more money to that to thank me for everything I had done for her son . I looked down at the paper and saw that I was holding a cheque for $ 3000 . I stared at it blankly and thought Its not going to bring him back .
Question: What may be the reason that her son can not be brought back ?
Answer:


He passed away .