"Inside the package was a notebook full of details about how he was going to kill people," the source told FoxNews.com. "There were drawings of what he was going to do in it—drawings and illustrations of the massacre."
The FBI declined to comment to the network, citing a gag order on the case. But Fox cites two separate police sources in its report. The details surrounding the discovery of the package in question are a little murky, however. According to the report, the psychiatrist (who is also a professor at the school) first alerted police about a different package that he thought was from Holmes. Only after it turned out to be from someone else, did police discover a second package with Holmes listed as the sender.