Dramatic video shows a heroic Walmart shopper armed with a gun confronting a knife-wielding maniac moments after he allegedly stabbed 11 people inside the Michigan store on Saturday night.

"I'm still sitting and grappling with the weight of realizing that it was kind of a life-or-death moment," said Julia Martell, who witnessed the stabbing, which wounded 11 people.

TRAVERSE CITY, Mich. − Authorities on July 27 were still trying to determine why a 42-year-old man went on a stabbing rampage at a local Walmart, wounding 11 people and prompting chaos as patrons scrambled to exit the building.

A suspect is in custody after a “multiple stabbing incident” at a Walmart in Traverse City, Michigan, Saturday, Michigan State Police said.