According to authorities, the package sat unopened in the mailroom for approximately one week and was discovered Monday.
Police and FBI agents were called to the University of Colorado Anschutz medical campus in Aurora on Monday morning after the psychiatrist, who is also a professor at the school, reported receiving a package believed to be from the suspect.
Although that package turned out to be from someone else and harmless, a search of the Campus Services’ mailroom turned up another package sent to the psychiatrist with Holmes’ name in the return address, the source told FoxNews.com.
A second law enforcement source said authorities got a warrant from a county judge and took the package away Monday night. When it was opened, its chilling contents were revealed.