GRAND RAPIDS, MI - Matthew Kolakowski had just left the Walmart checkout lane when a worker screamed that a man had a knife. Then, he heard a “mass wave of just blood-curdling screams from the back of the store.

A former Marine who helped confront the suspect in a stabbing rampage at a Walmart in Michigan is speaking out in an exclusive broadcast interview after the terrifying incident that authorities said was an act of terrorism.