Coleman suffered a brain injury Wednesday . Coleman is best known as the wisecracking youngster Arnold Drummond on TV 's `` Diff'rent Strokes '' from the late 1970s to the mid-1980s . Actor was awake and conscious Thursday morning . He was unconscious Thursday afternoon . He was placed on life support in the ICU .
Coleman suffered a brain injury Wednesday . Actor was awake and conscious Thursday morning . He was unconscious Thursday afternoon . He was placed on life support in the ICU .