科罗拉多枪击案嫌疑人霍尔姆斯曾发出警告

Law enforcement officials say the suspect in Friday's mass shooting at a Colorado movie theater sent a package to a university psychiatrist containing a notebook describing an attack.

The package, which reportedly included stick figure drawings of a gunman shooting people.   

The University of Colorado Denver said the postal service delivered a suspicious package Monday, which was turned over to authorities within hours.

The July 20 shooting killed 12 people and wounded 58 others.

Holmes was a Ph.D. student in neuroscience at the university before dropping out of the program last month.

Prosecutors expect to formally charge Holmes on July 30, and he could face the death penalty if convicted.