Drew Peterson and Stacy Ann Cales married in October 2003, when he was 49 and she was 19. Her sister Cassandra Cales said Stacy, who was a hotel receptionist when she met Drew, was very much in love with him when they married, per the Chicago Tribune. Their first child, Anthony, was born that same year, and they welcomed Lacy in 2005. Stacy also adopted Drew's two children from his marriage to Kathleen Savio, who were teenagers by then. Drew courted the teenager, showering her with gifts and attention, ABC News detailed. 

But it wouldn't be long after they married that Drew began to show his possessive nature. As Cassandra Cales told the Chicago Tribune, he isolated Stacy, preventing her from having contact with her friends, pressured her to get breast implants, and constantly accused her of infidelity. Stacy was planning to file for divorce around the time of her disappearance, a friend, Bruce Zidarich, told ABC. "She would always look over her shoulder. She said, 'I'm gonna tell him that I want a divorce.' ... It came up more and more often," Zidarich said.

Drew has argued Stacy told him she was running off with another man, which is why he didn't bother looking for her, he told ABC News. However, Drew's former fiancee, Christina Raines, said in a 2021 episode of "Cellmate Secrets" (via Patch) that Stacy knew Drew had killed Savio, which is what "doomed her."

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