Minnesota shooter Robin Westman had faced disciplinary action at work weeks before the fatal massacre at her former Catholic school.

Westman opened fire, killing two young children and injuring 17 other people as they sat in the pews during the Wednesday morning liturgy at Annunciation Catholic Church.

New details are starting to emerge about the shooter and their motives, after Westman posted a series of twisted YouTube videos showing off a handwritten manifesto and stashes of ammunition.

The killer left her job at a marijuana dispensary just weeks before Wednesday's attack after being disciplined over her attendance and allegedly making distressing comments in the workplace.

Westman, formerly known as Robert, was a transgender anti-Trump 23-year-old and previously attended the school.