 Early in the 2002–03 season, he graduated to the United States Hockey League (USHL).At 17, Miller played 49 games for the River City Lancers (now known as the Omaha Lancers) of the USHL in the 2002–03 season, posting 14 goals and 11 assists for 25 points.He scored nine points in 11 playoff games to help lead the Lancers to the USHL Finals, where they lost three games to one to the Lincoln Stars.