Mann died almost two weeks ago in his Los Angeles home, his wife Joan confirmed to The Hollywood Reporter on Friday, saying he died after a long sickness.
Mann was nominated for an Academy Award for his work on the 1965 film The Collector, a screenplay he co-wrote as an adaptation of John Fowles’ novel of the same title. The film, which starred Terence Stamp as a man who kidnaps and holds a young woman (Samantha Eggaralso) hostage, earned him and screenwriter John Kohn a Golden Globe nomination.
The Hollywood veteran also worked on films including Conan the Destroyer and Damien: Omen II and The Mouse That Roared.
He also dabbled in the production side of the business, producing Theatre of Blood in 1973 and his original Western, Draw in 1984.
Mann is survived by his wife, three children – Rachel, Adam and Daniel –, and four grandchildren. Funeral arrangements are pending.