How about: 'Be Still, My Beating Heart'?  This title says it all.  It names the heart, which is the central object of importance in Poe's short story.  It also commands that heart to be still, which, if that truly happened would signify death.  Therefore, it matches the idea of the murder in the story.  'Be still, my beating heart,' also means that the heart is pulsing rapidly because it is excited in some way (be it love, happiness, anxiousness, or fear).  So this fits the story because the murderer is certainly anxious and paranoid about having killed another man.