A man was found dead in his library. His forehead was resting on the keys of his tape recorder; a pool of blood lay on the desk beside him. From the door, the detective could see that the man's right hand covered the gun and that a bullet had entered his right temple.
The detective removed the tape recorder from under the man's head and pressed the play button.
A voice said, "I am not going to go on with a long winded farewell. I'm tired of life and all its anguish. I'll see you on the other side, wherever that maybe."
There was a gunshot and the sound of his head hitting the tape recorder keys, followed by a click indicating the recorder had been shut off.
The detective was certain that someone else had imitaded the man's voice and made this recording to sound like a suicide.
Why does he suspect murder???