Dallas star Linda Gray was the first cast member of the iconic show to find out who tried to assassinate J.R. Ewing in its most infamous cliffhanger.
Producers of the sex-and-scandal drama, which returned to TV screens this week, kept viewers hooked in 1980 with a season-ending plot in which the backstabbing oil baron was gunned down by a mystery assailant.
Producers were so obsessed with keeping the identity of the gunman a secret until the next season eight months later that they went to extraordinary lengths to hide it even from the stars of the show - but now Gray has revealed she was the first to find out.
The actress, who plays J.R.'s now ex-wife Sue Ellen, was required to film a section of dialogue in which she named her sister Kristin Shepard as the would-be assassin, and even that shoot was shrouded in secrecy.
Gray tells TheDailyBeast.com, "They took me to a recording booth and I'll never forget this. I kept asking, 'What am I saying?'. I had no idea. There was no script. Nothing was ever written down. They said, 'Here's what you're going to say.' The line was in a voiceover: 'Kristin, it was you who shot J.R.' Nobody saw it so the cameraman couldn't report it. Nobody could be there."