Jamie Foxx's younger sister, DeOndra Dixon, has died.br The Oscar-winning actor shared the sad news on Instagram on Monday.br Foxx posted a picture of himself with his sister and wrote: "My heart is shattered into a million pieces".br Foxx also wrote in his post that his sister was an ambassador for the Global Down Syndrome Foundation.br She is survived by her parents, brother, sister, and a large extended family.br DeOndra was 36 years old.