Actor Don S. Davis, best known for his long stint in the role of General George Hammond on Stargate SG-1, dies of a heart attack at the age of 65. Though his film and TV career didn’t begin in earnest until the early 1980s, by that time he had earned a doctorate in theater arts and had spent a decade sharing those skills with others as a teacher. One of his early gigs was standing in for Dana Elcar on the set of MacGyver, where he met future SG-1 co-star Richard Dean Anderson. He originated the character of Hammond in the premiere episode of Stargate SG-1, and his final appearance in the role is in the upcoming direct-to-DVD movie Stargate Continuum, due in late July. In addition to reprising his SG-1 role on sister series Stargate Atlantis, he has appeared on such series as The Dead Zone, Highlander, The Outer Limits, The X-Files and Twin Peaks.