The mother of the transgender killer who murdered two children in a mass shooting in Minneapolis has not been able to be located by police, officials have revealed.

Mary Grace Westman, the mother of shooter Robin Westman, 23, was a former employee at the Annunciation Catholic Church where the horror unfolded Wednesday morning.

The shooter, who previously went by Robert until changing names in 2019 to reflect 'identifying as a woman', killed two children and injured 18 other people in the shooting at the school church.

Westman was a former student at the school and graduated in 2017, according to a yearbook.

The killer also likely attended services at the church where her mom worked until her retirement in 2021.