Nonnie Dotson, 33, a USAF nurse, visits family and friends in Littleton, Colorado. One afternoon she tells family she’s going for a smoothie with friends. Dotson is never seen again. Joining Nancy Grace today:  Additional Guest Michael Whelan – Podcaster and Researcher: “Unresolved;” Instagram/Twitter: @unresolvedpod “Crime Stories with Nancy Grace” on Fox Nation is also a …