The family of a missing Chicago woman was offering a $10,000 reward seeking information about her disappearance.

Nailah Franklin, 28, a pharmaceutical sales representative for Indianapolis-based Eli Lilly, was last heard from a week ago. Police found her car in Hammond, Ind., Friday night near an abandoned building.

Chicago police interviewed a man last week but have not named him a suspect. Franklin filed a police report about threatening phone calls she said she received from the man. The man told FOX Chicago that he was not involved in her disappearance and offered to take a polygraph test.

Click here to watch the report on MyFOXChicago.com.

Franklin's family does not know the man, who has a criminal background including a 2001 escape from a federal courthouse and two orders of protection against him by his ex-wife and a girlfriend.`

Family and friends also launched a Web site seeking help in her disappearance and put up posters in a Chicago neighborhood.

Marina Franklin, Nailah's sister, pleaded for anyone with information to come forward.

"We have to keep active. We have to believe. You can't sit and wait for things to come to you," Marina Franklin said.

Franklin weighs about 110 pounds, with dark brown hair and a medium brown complexion.

Anyone with information should call Chicago police at 312-746-9259.