Who killed my father?

Here I am writing again… Here I am writing to you, my father, a lament from a heart that was unable to love you one day. Here I am placing you as a dot on the letter, writing you as a word on the line, revealing our secret willingly, and digging a grave that will accommodate me in the cemetery of my writings and papers. Oh my pen, can you describe what I lived through? Oh my papers, do you have the courage to fight my battles with me? Can I unravel this knot of a question mark? Who killed my father?

He hadn't uttered a single word since entering prison. His eyes were fixed on the same cell he'd entered one day. He laid his head on the pillow, his unspoken words saying: "Finally, I did it. Now I can sleep in peace!"