Keith Jesperson, the so-called Happy Face Killer, sent NewsNation's Laura Ingle four colorful portraits of The Beatles. Dr. Katherine Ramsland, a forensic psychologist who has spent decades researching serial killers, discusses why Jesperson continues to send letters and drawings to NewsNation. "He wants your attention," Ramsland said on "Elizabeth Vargas Reports." "He wants to keep a hook with you. Some kind of communication, affirmation from you that you're enjoying these. And that keeps him attuned to what you're doing. And you attuned to what he's doing." #KeithJesperson #HappyFaceKiller #VargasReports Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 6p/5C on NewsNation. #VargasReports NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to wa...