Steve Previn, 68, production executive and brother of composer/pianist Andre Previn, died July 9 in Palm Desert of unreported causes.A native of New York, Previn began his film career in 1943 as an editor for MGM and later Universal. Moving to Europe in 1950, Previn directed numerous television series and a decade later directed several features for Walt Disney in Europe. In 1965 he went to work for Eon Prods. in London as a television executive and in 1966 joined Paramount London as a film executive. In 1970 he segued to Commonwealth United as a production executive and also freelanced in Europe on several films. In addition to his brother, he is survived by his wife, Elizabeth, and son, Nicholas.