Sealed Envelope

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Acting on an anonymous tip, Sherlock Holmes picked the lock of a private office to discover a dead man seated at his desk. The man kept no weapons in the room and hadn't left a note. There were no signs of a struggle. The only clue was a sealed envelope on the desk in front of the man.
 
What did Sherlock Holmes conclude about how the man had died?

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Answer to previous riddle: There are no stairs in a one-storey house.

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