On September 21, 2001, Federal Protective Service Officer Ronald Sheffield, 36, was killed at the McNamara Federal Building in Detroit while on duty. Security had been tightened following the September 11 attacks; a call about a man with a gun at the building’s metal detectors led Sheffield to approach a person waiting in the security line. That individual produced a .357 caliber handgun and opened fire, fatally wounding Sheffield. Other officers returned fire, wounded the shooter and took him into custody.

The assailant was identified as David Sera. Sheffield was a U.S. Marine Corps veteran and was survived by two daughters.

What does anyone remember about the security scene at the McNamara Building that day or about Officer Sheffield’s work there?