Shooting suspect quiet as he faces court

The suspected gunman in the Colorado theater massacre headed to his first court appearance on Monday, but authorities said he refuses to talk, and it could take months to learn what prompted one of the worst mass shootings in US history.

James Holmes, 24, has been held in solitary confinement awaiting his hearing, where the charges of suspicion of first-degree murder will be read against him. Friday's shootings left 12 dead and 58 wounded, some critically.

"He's not talking to us," Aurora Police Chief Dan Oates said.