Rapper Mac Miller has reportedly died of an overdose. Miller was found dead Friday at his home in California's San Fernando Valley. The Pittsburgh-born Miller had dated Ariana Grande from 2016 until earlier this year. She collaborated with Miller, singing on and appearing in the video for his track, "My Favorite Part." Miller's latest record, "Swimming," was released in August. His tour to support the album was set to begin in October. Mac Miller was 26.