Mann, who received his Academy Award nomination for co-writing the adapted screenplay for "The Collector" (1965), died January 11 at his home in Los Angeles after a long illness, his wife, Joan, told The Hollywood Reporter.
"The Collector", directed by William Wyler, who abandoned "The Sound of Music" for the project, was a psychological thriller about a creepy bank clerk (Terence Stamp) who imprisons a young art student (Samantha Eggar) in a house in the country. Wyler and Eggar also received Oscar noms for their work.
Mann also co-wrote with Roger MacDougall the Peter Sellers film "The Mouse That Roared" (1959).
Mann wrote three films that starred Sean Connery -- "Another Time, Another Place" (1958), "Woman of Straw" (1964) and "Meteor" (1979) -- and adapted novels by Stephen King and James Clavell, respectively, for the movies "Firestarter" (1984) and "Tai-Pan" (1986).
An association with producer Dino de Laurentiis led to his work on "Firestarter" and the sequel "Conan the Destroyer" (1984).
Mann's resume also includes "The Mark" (1961), "Rapture" (1965), "Up From the Beach" (1965), Frank Sinatra's "The Naked Runner" (1967), "Russian Roulette" (1975), the Donald Sutherland-starrer "Eye of the Needle" (1981) and Hanna's "War" (1988).
A native of Toronto, Mann attended McGill University and began his career in his late teens as a writer and actor for CBC Radio. In 1954, he moved to London and then came to Los Angeles in the 1970s. In 1978, he published a novel, "Third Time Lucky".
In addition to his wife, survivors include his children Rachel, Adam and Daniel, sisters-in-law Denise and Gilda and four grandchildren.
A memorial service is pending.