“You can’t libel a dead man – or so the phrase goes. And it’s one that’s given comfort to scores of biographers through the years. On the other hand, it doesn’t stop heirs and estates from trying to preserve the reputations of their dearly departed, suing or threatening to sue at any perceived slight. Toronto playwright Jason Sherman learned that firsthand recently when the estate of Marshall McLuhan blew up a sandstorm that, temporarily at least, has stalled plans to mount his play about the late media guru at Toronto’s Tarragon Theatre.”