Detective Murder Or Suicide Puzzle
A homicide team enters a crime scene where a dead body of a fat old man lies there on the floor with blood oozing out of his head. The victim is holding a gun and a tape recorder lies there by his side. One of the detective picks up the recorder and plays it "I am tired of this life and hence I have decided to relieve myself from the worldly pains". A gunshot follows the message. The teams starts investigating a murder investigation. Why?



If the man killed himself, he would not have been able to rewind the cassette. Therefore it is clear someone else killed him.
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If was a suicide , detective had to rewind the cassette