Since in theatrical parlance to die means to flop or fail to deliver a convincing performance or production, I think the hed has a double meaning for those who read it ....AND given the nature of the deceased's profession/avocation, many theater people would!
Perhaps something more applicable to his actual theater work would be better ....
Producer Robert Wilson dead
Dramatist Robert Wilson dead
Actor, manager, etc etc.
As for "icon" ... too many taking the easy word.
Now, in my day ...(old-time Editor maundering on ...)
wow