The unsolved murder of Frauke Liebs:
Frauke Liebs was a nursing student from Paderborn, Germany. On June 20 2006, she was last seen leaving the pub where she'd spent the evening with a friend at 11 PM. Despite sending a text message to her housemate later that night saying she'd be home soon, she never came home and she didn't show up for work the next day (which is when she was reported missing). The text message was later found to have been sent from Nieheim, a town located 35 kilometers from Paderborn.
Edit: the timing of the first text message was also off. Her home was only located 1.2 kilometers from the bar, so it should've taken her at most 20 minutes to get home. In spite of this, the text message was sent at 0:49 AM, nearly 2 hours after she left the bar.
In the following days, Frauke would call and text her housemate multiple times. These calls and text messages originated from different industrial areas of Paderborn. She insisted she would return home soon, but she only gave vague or cryptic answers when asked about her current situation. Her last phone call to the housemate was made on June 27, when her sister was also present. During this conversation, she was asked if she was being held captive – to which she first answered ”yes" in a quiet voice, only to follow up with "NO" in a much louder voice. Contact broke off after that call.
Frauke's body was discovered by a hunter in a ditch close to road L 817 in October 2006, still wearing the clothes she was wearing on the day of her disappearance (but with her purse, cellphone, watch and wallet missing). Because of the skeletonized state of the body, the time and the cause of death couldn't be determined. It's theorized that she was held captive in the Nieheim area and murdered some time after the last call she made. The killer likely forced her to make the phone calls and messages that were traced to the Paderborn area in order to mislead her family and the police.
Although the police interviewed over 900 people and was able to narrow the investigation down to five suspects, all suspects were eventually cleared.