Question

Can you answer this Riddle?
A man was found dead in his study. He was slumped over his desk and a gun was in his hand. There was a cassette recorder on his desk. When the police entered the room and pressed the play button on the tape recorder they heard: "I can't go on. I have nothing to live for." Then there was the sound of a gunshot. How did the detective immediately know that the man had been murdered and it wasn't a suicide?

Answer 1

because someone nor the other had to rewound the tape.

Answer 2

detective knew that it was a murder because- when he shot himself then someone must be there who stopped the recording coz he can't do itself after shooting himself.