Article continues below advertisementCharlie Kirk had a "secret sister" who apparently had radically opposing views than her older brother - who was assassinated at age 31 on Wednesday, September 10, while speaking at Utah Valley University.The right-wing political activist's younger sister, Mary, 29, wasn't nearly as public with her opinions as Charlie was, however, she previously vocalized her support for Democrat Bernie Sanders via her Facebook account, which she uses an alias for.