The family of former police sergeant Drew Peterson's ex-wife claims that her signature on a legal document that allowed him and his then 18-year-old girlfriend to buy a house is fake, the Chicago Sun-Times reported.
Kathleen Savio's family questions the signature, which looks different from more than a dozen other signatures she wrote before her death in 2004.
Peterson needed Savio's signature to allow him to purchase a house in 2002 for himself and Stacy Cales. Peterson later married Cales, his fourth wife who was reported missing on Oct. 29 after she failed to show up at a friend's house.
Peterson, a suspect in his wife's disappearance, denies any involvement and claims that she left him for another man.
Savio's 2004 death was ruled accidental after she was found in a waterless bathtub. Authorities reopened the investigation and exhumed her body for a second autopsy after the initial cause of death came under question.
Savio's family says the signature on documents to sign away her share of Drew Peterson's home were forged.
"That's definitely not her signature," Anna Doman, Savio's sister told the Sun-Times after reviewing the signature. "I know that's not her signature."
Peterson backs up the validity of the signature and referred additional questions to his attorney.
"If it was a forgery, she had ample time to have her and her lawyer object and make an issue of it," said Peterson's lawyer, Joel Brodsky. "Obviously it could have been done better, but I don't know that it's anything untoward."