Nearly a dozen people were injured in the attack before citizens -- including Derrick Perry, who was armed with a gun -- ...

A former Marine who was armed with a gun confronted the suspect accused of stabbing several people at a Michigan Walmart.

Derrick Perry says he's no hero for helping subdue Bradford James Gille, who faces terrorism and assault charges for ...

Derrick Perry, a United States Marine veteran, confronted a knife-wielding man in the parking lot of the Traverse City ...

Marine veterans Matthew Kolakowski and Derrick Perry helped stop a man accused of attacking 11 people near Traverse City, ...

Munson Healthcare is confirming that Derrick Perry, a Munson employee, was among the group of good samaritans that confronted ...

Perry was captured on video confronting a Cheboygan man after he allegedly stabbed 11 people at a Walmart store in Garfield Township.

The armed bystander who confronted the suspect in a mass stabbing at a Traverse City Walmart over the weekend spoke to Good Morning America.

The good Samaritan who held the Traverse City Walmart stabber at gunpoint has been identified as a worker for Munson Healthcare.

O'Brien and Kolakowski, who are brothers-in-law, were visiting the Walmart to pick up supplies for a family vacation when the ...

Matt Kolakowski and Chris O'Brien from Grand Rapids share how they helped stop the stabbing incident while on their family vacation in Traverse City.

GRAND RAPIDS, MI - Matthew Kolakowski had just left the Walmart checkout lane when a worker screamed that a man had a knife.