Ashley Keller, 21, was last seen on July 4 around 12 p.m. in Warminster, Pa. Investigators say she was with 21-year-old Romulo Perez-Catalan, aka Rony, who has several active warrants for his arrest.
Chicago police say Keller was located Wednesday. Perez-Catalan is in police custody and will be extradited to Pennsylvania.
Keller has been listed as missing and endangered, Warminster police said. Police were searching for an older, blue, two-door vehicle with a dent on the passenger door, rust around the rear bumper on the passenger side and a back seat filled with items.
Keller is described as 5'1", weighing 130 pounds, with brown hair and blue eyes. She has a tattoo of a hummingbird with a flower on her right foot.
Perez-Catalan has been arrested previously for assaulting Keller. He reportedly was released from prison in April and failed to show up for a court appearance last week on a burglary charge.
The Sun-Times Media Wire contributed to this report.