Children's Place Retail Stores Inc
The company said John Taylor, vice president, finance, will take over as interim principal financial officer.
The kids' apparel retailer's last chief financial officer, Richard Paradise, had resigned in August 2008 and Riley had assumed his responsibilities.
Shares of the Secaucus, New Jersey-based company closed at $43.67 on Thursday on Nasdaq.
(Reporting by Aditi Sharma in Bangalore; Editing by Anne Pallivathuckal)