Martin Sheen played the NYPD cop in 1985 movie

New York City detective Edward Zigo, who cracked the notorious Son of Sam case in the 1970s and arrested killer David Berkowitz and went on to serve as an adviser on several films, died Saturday of cancer in Lynbrook, N.Y. He was 84.

Berkowitz was convicted in 1978 and remains in prison. He said he was ordered to kill by a demon that had possessed his neighbor’s dog.

Zigo retired from the NYPD in 1982; he parlayed his knowledge into a second career working on TV and film projects about the Son of Sam and other crime stories.

Martin Sheen played Zigo in CBS’ 1985 telepic “Out of the Darkness,” which was told from Zigo’s point of view; he also had a bit part. He also served as a technical adviser on the feature films “Off Beat,” with Judge Reinhold, and “The January Man,” with Kevin Kline, as well as the made-for-TV movies “Doubletake,” “Murder in Black and White” (in which he had a bit part as a detective) and “Murder Times Seven.”

Zigo is survived by his second wife, Eileen; a son and a daughter; and eight grandchildren.

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