James Karen, the instantly recognizable character actor who moved the cemetery’s headstones — but not the bodies — as the developer Mr. Teague in the modern horror classic Poltergeist, has died. He was 94. The incredibly prolific Karen, who also was noteworthy in such films as The China Syndrome (1979) and The Return of the Living Dead (1985) and on the finale of NBC’s Little House on the Prairie — he’s the dastardly reason the town of Walnut Grove was blown up — died Tuesday at his Los Angeles home, his wife, Alba, said.