Kelly Clarkson's former husband, Brandon Blackstock, passed away from melanoma at his Montana home, ending a three-year private fight against the deadly skin cancer.

In a resurfaced viral video taken on July 26, 12 days before Blackstock passed, Clarkson could be seen breaking down in tears ...

Video of Kelly Clarkson's performance of Piece by Piece just 12 days before ex-husband Brandon Blackstock's death.