The suspect at times went off on tangents about cigarettes filled with fiberglass and seeing videos about psychotropic drugs.

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

The suspect, Bradford James Gille, fled to the parking lot. Perry, shown in the video wearing a white T-shirt and khaki ...

Derrick Perry speaks with ABC News on Good Morning America./ABC News(TRAVESE CITY, Mich.) -- A former Marine who helped ...