The original story is linked here, and the update, written by the same reporter the next day is here. The articles are from the St. Paul Pioneer Press.
The second article is noticeably longer, likely due to the added information. The lead changes, but does not mention the name of the dead man. His name is mentioned in the second paragraph of the follow article. The second lead simply adds the body has been identified and that it was a government worker.
The stories between the two articles seems to be almost the same, in respect to the information told, the one exception being the name of the dead person. However, the follow article seems to be almost completely rewritten.
The second story also fills in a little background information about the dead body found. They state his role at the company and also mention that counselors or "assistants" as they say will be available to the dead man's associates.
Something interesting about the first article that I noticed was that the police said they thought the body was of someone who disappeared. The second article confirmed the suspicion laid out in the first, saying it was indeed the government worker who had gone missing. This was one way they advanced the story, but at the same time tying back to the original article.