No, Dwight Howard did not voluntarily leave Dancing With The Stars (DWTS); he was eliminated from the competition.
During his participation in the popular dance reality show, the former NBA star was eliminated, which meant his journey on DWTS came to an end by the decision of the judges and audience votes, rather than a personal withdrawal. His elimination occurred as other contestants, such as Ilona Maher and Nedoroscik, advanced in the competition.
