 Miller attended John Muir High School in Pasadena, California, where he was a track standout, winning the 400 metres at the CIF Southern Section meet in 1983.He also competed in the long jump, 100 metres (10.3 seconds), 200 metres (20.6 seconds) and relay events.He joined a football team for the first time in his life as a senior, at the urging of head coach Jim Brownfield.