Colorado is no stranger to good recognition and positive publicity, constantly making 'top 10' and 'best of' lists – but it's not always sunshine and happy days here in the Centennial State. Some incredibly dark crimes have taken place in Colorado, gaining national and sometimes international attention due to their grim details.

Infamous Colorado Crimes

Take a look at some of Colorado's most notorious crimes.

Law enforcement agencies continue to investigate the cases that remain open, hoping to find answers for these Colorado residents and families.

6 Infamous Inmates of Colorado's Supermax Prison