Glenwood Springs

A heavily armed man who was found dead at a Colorado mountaintop amusement park last year had researched mass shootings online, but authorities say they still haven't determined why he amassed such an arsenal or didn't follow through on "whatever he was planning."

The body of a heavily armed man who authorities suspected was planning a "heinous" attack at a mountaintop amusement park in Colorado was discovered with a self-inflicted gunshot wound in the bathroom at a building that houses a ride that drops 110-feet deep into caverns.