One deck marks 52 unsolved cases, and authorities have two additional decks in the works. There are currently 1,600 unresolved cases in Colorado, including 1,330 homicides.
In the first deck of cards, the seven of diamonds and the seven of hearts feature two women whose bodies were found south of Breckenridge in 1982. Bobbi Jo Oberholtzer was found with a gunshot wound near the summit of Hoosier Pass. Annette Schnee was found with a similar wound six months later in rural Park County.
The Colorado Bureau of Investigation first started distributing the cards in October, and after a successful test run, sent them to local law enforcement agencies and detention centers in January.