Who was the person that was the child of ex-slave developed a hair product and died a millionare?

The person you are referring to is Madam C.J. Walker, born Sarah Breedlove in 1867. She was the daughter of formerly enslaved parents and became a pioneering African American entrepreneur by developing a line of beauty and hair care products specifically for Black women. Walker's innovative marketing strategies and business acumen led her to become one of the first female self-made millionaires in the United States. She passed away in 1919, leaving behind a legacy of empowerment and financial independence.