Survivors and investigators are spending Thanksgiving questioning the motive behind a mass shooting in a Virginia Walmart that left 6 workers dead

Lashana Hicks (left) joins other mourners Wednesday at a memorial for those killed in a mass shooting at a Walmart Supercenter in Chesapeake, Virginia.

After an ordinary workday turned deadly at a Walmart in Chesapeake, Virginia, survivors and investigators are spending the Thanksgiving holiday questioning the motive of an employee who opened fire on coworkers, killing six before fatally turning the gun on himself.

Employees were preparing for an overnight shift Tuesday when a manager opened fire with a handgun in the break room just after 10 p.m., officials said.

CNN's Chris Boyette, Amanda Jackson, Paul P. Murphy, David Williams, Holmes Lybrand, Michelle Watson, Holly Yan, Ariane de Vogue, John Miller, Caroll Alvarado, Curt Devine, Eliott C. McLaughlin, Paradise Afshar, Christina Maxouris, Dave Alsup, Joe Sutton, Braden Walker, Lauren Koenig, Brian Todd and Josh Campbell contributed to this report.