Crystal Arensdorf was last seen in the early morning hours of July 4th, 2001, at Knicker’s Saloon in Dubuque, Iowa. Earlier that evening, Crystal watched the annual fireworks display by the river before heading over to Knicker’s with several friends.

Crystal was last seen around 2 am inside Knicker’s. According to witnesses, Crystal and the bartender had plans to share a cab to continue the night in East Dubuque, Illinois, across the river, but no one ever saw her leave the bar.

Crystal's family knew something was wrong when they hadn't heard from her the next day, which was completely out of character for her.

Crystal’s keys and purse were later found at Knicker’s, and all the patrons and staff were interviewed, and polygraphs were given to some suspects, but her case is still unsolved 25 years later.