Webmore than 200,000 unsolved cases have gone cold since 1980. Uncovered is the nation’s largest database of information powered by you. Webhere are four cold cases that were solved because of the work and persistence of citizen sleuths who entered the true crime world online—and found truth in a web of death. Web— the hamilton county district attorney's office no longer has an active cold case unit. And that's prompted some victims' rights groups to share an online. Websheryl sheppard, a missing hamilton woman who vanished almost two decades ago, left behind an audio tape for her sister, with instructions to give it to the. What it means to name a forgotten murder victim. Webin this episode we peel back the layers of deception to reveal the dark secrets hidden behind closed doors. We’ll unravel the complex psychology behind. Webin hamilton county, the definition of a cold case is any unsolved homicide that is five years or older. The current district attorney's office says there are more than.