"Dallas" - "A House Divided" - March 21, 1980

 On this day forty-two years ago, a mysterious assailant gunned down the ruthless oil magnate J.R. Ewing...

The audience would have to wait until November 21, 1980, to find out if the unscrupulous J.R. lived and who pulled the trigger.

He lived.

It was his sister-in-law and mistress, Kristin Shepard (Mary Crosby)