Indiana police are baffled by the murder of an 86-year-old woman, found dead in her bedroom. A small drop of blood on a curtain holds the key to unlock their mystery. <a href="http://Homes.com" rel="noopener noreferrer" target="_blank">Homes.com</a>: We’ve done your homework. Progressive: Multitask right now. Quote your car insurance at <a href="http://progressive.com/" rel="noopener noreferrer" target="_blank">Progressive.com</a> to join the over 28 million drivers who trust Progressive.See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.

REOPENED: Nacole's Killer: Part 2

Based on the iconic, Emmy-nominated series on A&amp;E, this show explores some of the most difficult-to-solve murders, which stymied investigators and went cold, sometimes for decades. In fact, one-third of all murders in America remain open. But thanks to dogged investigators and breakthroughs in forensic technology, these cases become part of the rare 1% of cold cases that are ever solved. Cold Case Files is narrated by Marisa Pinson.