George Tiller planned to start a dermatology residency. However, on August 21, 1970, his parents, sister and brother-in-law were killed in an aircraft accident. In her will, his sister requested that Tiller take care of her one-year-old son. Tiller had intended to go back to Wichita, close up his father's family practice and then go back to become a dermatologist. However, he quickly felt pressure to take over his father's family practice. Tiller's father had performed abortions at his practice. After hearing about a woman who had died from an illegal abortion, Tiller stayed in Wichita to continue his father's practice. At
Kelvin Tiller Vitkay at Bellator 88 on February 7, 2013. However, when Tiller failed to make weight for the third consecutive time, the bout was cancelled and Tiller was subsequently released from his Bellator contract. After parting ways with Bellator, Tiller faced Chris Henning on June 29, 2013 at Epic Fight Night 1: Stinson vs. Kimmons. Tiller won via submission in round one. In November 2013, Tiller signed a multi-fight deal with World Series of Fighting. Tiller was scheduled to face Ronny Markes at on August 9, 2014, but when Krasimir Mladenov pulled out of his fight with Elvis Mutapcic due to