Suspect had long history of mental health issues and was charged with mutilating a grave in 2016. He also had run-ins with police at least twice this year.

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

One of the men who authorities say helped take down a suspect who stabbed eleven people at a Walmart told NBC News about how he sprung into action. Marine veteran Matthew Kolakowski says he took off running after the suspect and rammed him with a grocery cart to prevent him from hurting more people.

Of the 11 people who were attacked, six remained in fair condition as of late Tuesday morning, while one was listed in good condition.

In an ABC News exclusive, Derrick Perry recounts his confrontation and pulling his gun on the man accused of stabbing 11 people at a Michigan Walmart.