It was late afternoon, December 3, 1998 when Mark Jensen found his wife, Julie, in their bed where she lay under the covers, not breathing. EMTs arrived quickly, but it was too late to save her. However, one responder noticed something unusual. There was something...off...about the way her face and body looked. And what's more, they could tell Julie had been dead for a while but had no idea how she died. There was nothing obvious, no visible wounds or signs of trauma. So what was going on here? And what, or WHO, had killed Julie Jensen? This episode comes from the Dateline episode "Secrets in Pleasant Prairie" LOOKING FOR MORE TCO? On our Patreon feed, you'll find over 400 FULL AD-FREE BONUS episodes to BINGE RIGHT NOW! Including our episode-by-episode coverage of "Love Has Won", "The Curious Case of Natalia Grace," "House of Haammer" "Trainwreck: Woodstock '99," "Bad Vegan" "LuLaRich" "John Wayne Gacy: Devil in Disguise" "Night Stalker" "The Jinx," "Making A Murderer," "The Staircase," "I'll Be Gone in the Dark," "A Wilderness of Error" "The Vow"  "Tiger King" "Don't F**K With Cats," "The Menendez Murders," "The Murder of Laci Peterson," "Casey Anthony: American Murder Mystery," "Serial," "Lorena," "The Disappearance of Madeleine McCann," "OJ: Made in America" and so many more!