You cannot hear the name Martin Luther King Jr. and not think of death. For as famous as he may have been in life, it is death that ultimately defined him. To be sure, King was courageous in the face of death. But the unrelenting threat of bombs exploding and snipers shooting took its toll. King suffered desperate stretches of depression that sometimes alarmed his closest aides and friends. He fought valiantly to maintain sanity and focus in the midst of the surrounding turmoil. One of his top aides wanted him to consult a psychiatrist because of his steep descent into...