Watch Nancy Grace Mysteries Friday at 8 p.m. ET on HLN to see Nancy Grace's in-depth look at the murder of JonBenet Ramsey.
JonBenet Ramsey is just one of many murder victims in Colorado whose cases remain unsolved. A cold case database maintained by the Colorado Bureau of Investigation contains nearly 1,300 murder cases, some dating back into the 1950s. These are only a few of the others.
The site also contains a list of more than 200 unsolved missing persons cases.