Can this be true?

Concerning the 1968 true-crime drama The Boston Strangler: "20th Century Fox originally hired English playwright Terence Rattigan [The Winslow Boy, The Browning Version] to write the screenplay based on Gerold Frank's book, but he wrote it as a comedy and was replaced by Edward Anhalt. In Rattigan's version, the killer was revealed, by a computer, to be [20th Century Fox head] 'Daryl F. Zanuck' ."

It's at IMDB (which is suspect) but also at Turner Classic Movies and at Fox Studio Classics [UK], though all are similarly worded and perhaps repurposings of one error somewhere.

But if it's true, major kudos to Terence Rattigan.