Sister Mary Margaret Kreuper, 79, has pleaded guilty to embezzling over $835,000 from St James Catholic School in Torrance, California, over the course of a decade.

She served as headmistress of the school for nearly three decades and the embezzlement was not discovered until after her retirement, The Times reports.

Her lawyers said she was “very remorseful” and had “accepted full responsibility for what she had done”.