Don S. Davis, best known to genre fans as Maj. Gen. George Hammond in the Stargate television and film franchise, died on June 29. He was 65. Davis was a co-star during the first seven years of “Stargate SG-1.” As a result of a medical condition, he cut back to making guest appearances on “SG-1″ until the show wrapped at the end of its 10th season. He also brought Gen. Hammond to several episodes of “Stargate: Atlantis.” His final franchise appearance will be in the upcoming direct-to-DVD film, “Stargate: Continuum,” scheduled for release on July 29. He appeared in numerous films, including “Far Cry,” “Woodshop” and “Vipers,” all of which are in post-production. He guest-starred on several television shows, such as “Supernatural,” “The Dead Zone” and “Flash Gordon.” Davis …