A man was found shot dead in his dining room. He was slumped over his dining room table, and a casette recorder was on the table, with a casette in it. When the detectives arrived and pressed "PLAY" on the recorder, they heard his last words:

"If you are listening to this, you should know why I am dead. There are so many reasons. Goodbye." Then there was the sound of a gunshot, and a thump as he landed on the table.

He did not kill himself. Somebody killed him. But how can you tell this? Feel free to ask questions about his position, the gun, fingerprints, whatever.

PS: I messed with the wording enough to stop you from being able to Google it
PPS: adidas you are disqualified because you are good at these.