A man bought a package. On the next day, his body was found on a grassland. The package was unopened. He was dead.
Hint: He did not need to consume anything (or anything inside the package), neither was the package’s content the cause of death.
If you think this question is too broad:
Question is not a duplicate of the parachute riddle, neither is it too broad. The answer was found easily by Phylyp. Also the answer (death cause) is related to the description, so it clearly was not too broad. (For example: A killer killed him wouldn't make sense, as it has nothing to do with the description of the riddle).