Marshall was last seen at her home in the 200 block of east Tennessee Street in Evansville, Indiana on June 15, 1993. She was living with her ex-husband, Gary W. Head, at the time. They had divorced in January after a three-year marriage, but in April he had moved back in with her. A photo of Head is posted below this case summary. He stated he fell asleep at 2:00 p.m. and when he woke up half an hour later, Marshall was gone. He said she'd dropped out of sight before and he expected her to return. She has never been heard from again.

Marshall left behind all her belongings, including her purse, her jewelry and her black Corvette, which Head drove after her disappearance. Her adult daughter reported her missing on June 29, after Marshall failed to attend a family Father's Day celebration. Authorities learned that she quit her job at a local tavern the day before she disappeared. On the day she was last seen, someone delivered a dozen roses to the tavern with a card reading "Daisy." Marshall promised to stop by to pick up the flowers, but she never did. In early July, a few weeks after Marshall's disappearance was reported, Head left the area abruptly. He resurfaced a few days later in Orlando, Florida.

In 1998, Head was charged with Marshall's murder. Prosecutors stated he was angry over their divorce and the fact that Marshall got most of the couple's assets in the settlement. He allegedly offered a co-worker $30,000 to kill her in the spring of 1993, and discussed different ways he could dispose of her body. The prosecution had no witnesses to the alleged murder and no physical evidence. After six hours of deliberation, the jury acquitted Head of all charges. He remains the prime suspect in his ex-wife's disappearance.

Marshall's body has never been found. Foul play is suspected in her case due to the circumstances involved.

Above: Gary Head, circa 1998