A day after state police and the U.S. Coast Guard combed a canal adjacent to the Des Plaines River for any clues related to Peterson's disappearance, her sister Cassandra Cales called into the "Mancow" Muller radio show on WLS radio to accused Drew Peterson of murdering his wife.
"You killed her after she got off the phone between 10:15 and 10:59," Cales said. "The state police know where you were and what you did and you will pay."
Cales went on to say she believes that Drew Peterson will soon be charged and will spend the rest of his life in prison.
Stacy Peterson disappeared in October 2007. Drew Peterson has said she ran off with another man.