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He had a hand in more than 50 films, many for PBS’s “Frontline,” including a series on the English language and an exploration of J. Edgar Hoover’s secret life.

By Clay Risen

William Cran, an Emmy-winning master of the television documentary whose expansive body of work, primarily for the BBC and the PBS program “Frontline,” delved into complex subjects like the history of the English language and the private life of the F.B.I. director J. Edgar Hoover, died on June 4 in London. He was 79.

His wife, Vicki Baker-Cran, said cause was complications of Parkinson’s disease. He died in a hospital.