I am sorry, we have found that you are too old to fulfill your job requirements. You had a good run. Many respected you out of fear. That is more than most serial killers could ask.
But I am a seasoned veteran! A professional in the field!
and what better way to go out than on top! You are the best! Go out as the best! Here comes your replacement now..
Oh please, a MASKED serial killer? How cliche. How old are you anyway?