'AGT' judge Simon Cowell will 'never forget' this school shooting survivor's audition: Watch

America's Got Talent judges have seen a lot of action

one performance on Tuesday's episode left a lasting impression on Simon Cowell.

Ava Suiss, an 18-year-old high school student from Oxford, Michigan.

a message was displayed that her audition had been recorded

Four of her classmates, including her teacher, were killed

Cowell asked Switzerland how she felt after the tragedy. “It was hard.