They went to Walmart to pick up fishing poles, pop and snacks for a day on the lake. They wound up stopping a stabbing.

A Walmart employee was helping a customer check out when she heard a warning that someone in the store had a knife.

Matthew Kolakowski was shopping with his daughter at a Michigan Walmart when he heard screams and saw a man with a knife.

"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.