Det de Beus was born Anna Maria Bernadette de Beus on February 18, 1958 in Utrecht in the Netherlands. She was the first goalkeeper in women's field hockey to wear a mask back in January 1982.

A player from Eindhovense Mixed Hockey Club in Eindhoven, De Beus played in goal for the Netherlands between 1978 and 1988. She played 105 caps for her country and was part of the gold medal winning Olympic team in the 1984 Summer Olympics in Los Angeles. She retired from the sport at the end of Olympic Games in Seoul in September 1988 after winning the bronze medal by beating Great Britain 3-1 to clinch the medal.

She died of cancer in Rijswijk in July 2013.

Community content is available under CC-BY-SA unless otherwise noted.