He then played with the NBA D-League clubs the Albuquerque Thunderbirds and the Rio Grande Valley Vipers. In 2009, he tied Morris Almond's D-League single-game record with 53 points, but this was surpassed by Pierre Jackson in 2014 (58). He was called up by the Houston Rockets from the Vipers on January 29, 2010 on a 10-day contract, and returned to the Vipers when the contract expired on February 8. Conroy was again recalled by the Rockets on March 2, 2010, and sent back to the Vipers on March 11, 2010.