Sources: Bears center Dalman retiring at age 27

Key Highlights

• Drew Dalman retires from the Chicago Bears at age 27.
• He played five seasons in the NFL, earning a Pro Bowl selection.
• Dalman was signed to a three-year, $42 million contract last offseason.
• His retirement creates a vacancy at the center position for the Bears.
• The Bears overhauled their offensive line in head coach Ben Johnson's first season.