Cacsmy Brutus was born in Brooklyn, New York City, on November 20, 1989. She grew up in Haiti, and at age 14, she was diagnosed with osteosarcoma and lung cancer—doctors gave her three weeks to live. Two years later, she received a hip replacement which failed, leading to the amputation of her right leg. She later said that it took several years to regain her confidence and that she hid her prosthetic leg for several years.

On September 15, 2016, Cax was invited to the White House to participate in a fashion show put on by Barack and Michelle Obama. At that time, she was working in the office of the Mayor of New York City while finishing her studies.

In 2017, Cax appeared in her first commercial advertisement, and soon signed with the modeling agency JAG Models in New York. Among her appearances, she walked the runway in shows for Chromat and Rihanna’s Fenty Beauty. Her later commercial work included ad campaigns for Tommy Hilfiger and Sephora.

She walked at New York Fashion Week in 2018, parading in a swimsuit designed by Becca McCharen, who seeks to change the “standards of beauty”. That year, she made the cover of Teen Vogue with Jillian Mercado and Chelsea Werner.

In 2019, Cax became the face of Olay brand for their sunscreen marketing campaign. In October 2019, Cax announced she would be participating in the New York Marathon in a wheelchair.

While in England in December 2019, Cax was admitted to Royal London Hospital, suffering from severe abdominal pains and blood clots in the lung; she died in the hospital on December 16, 2019.