CHICAGO (AP) — Authorities investigating the disappearance of a former suburban Chicago police officer's wife have obtained a warrant seeking information to identify who sent a racy text message to her cell phone.

Drew Peterson's attorney, Joel Brodsky, said Thursday that a message sent to Stacy Peterson's cell phone in September shows she was having an affair and lends credence to Drew Peterson's contention she left him for another man.

Stacy Peterson vanished Oct. 28. In November, police labeled the 23-year-old's disappearance a possible homicide and named Drew Peterson, a former Bolingbrook police sergeant, a suspect. He has not been charged and denies any involvement in her disappearance.