A University of Colorado psychiatrist treating suspected theater shooter James Holmes rejected an offer to put him on a 72-hour psychiatric hold after he told her on June 11 that he fantasized about killing "a lot of people," a source told The Denver Post.

Six weeks later, authorities say, Holmes carried out his fantasy, killing 12 people and injuring at least 58 others in a massacre at the midnight premiere of a Batman movie at an Aurora cinema.

The newly revealed development in the theater shooting was first reported by 7News and later confirmed to The Denver Post by a source close to the investigation who asked to remain anonymous.