Marie-Clémentine Anuarite Nengapeta was born on December 29, 1939, in Wamba, Democratic Republic of Congo, into the Wabudu tribe. She was the fourth of six daughters to Amisi Batsuru Batobobo and Isude Julienne. In 1945, Anuarite and her mother were baptized into the Catholic Church, marking the beginning of her deep commitment to her faith. Despite her mother's initial opposition, Anuarite felt a strong calling to religious life and, at the age of 16, joined the Congregation of the Sisters of the Holy Family in Bafwabaka. She took the name Sister Marie-Clémentine upon her profession on August 5, 1959. Known for her humility, obedience, and dedication, she served her community through teaching and various household tasks.

In 1964, during the Simba rebellion, the political turmoil in the newly independent Congo posed significant threats to religious communities. On November 29, 1964, rebels attacked her convent and forcibly took Sister Marie-Clémentine and her fellow nuns to Isiro. During their captivity, Colonel Pierre Olombe attempted to coerce Sister Marie-Clémentine into becoming his wife. Her steadfast refusal led to violent retaliation; despite severe beatings and threats, she remained resolute in her commitment to her vows. On December 1, 1964, after enduring brutal assaults, she was fatally stabbed and shot. In her final moments, she forgave her assailant, saying, "I forgive you, for you know not what you are doing."

Sister Marie-Clémentine's martyrdom resonated deeply within the Catholic community. Her cause for beatification commenced in 1977, and she was beatified by Pope John Paul II on August 15, 1985, during his visit to Kinshasa.