Watch: This Is the Exact Moment Matthew McConaughey Found out About Sam Shepard's Death

Matthew McConaughey learned of his former costar Sam Shepard's death while walking the red carpet for his upcoming film Dark Tower.

When asked about Sephard's passing, McConaughey was taken by surprise and said, "Sam Shepard moved on?"

McConaughey worked with the actor, who died on Thursday after complications from Lou Gehrig's disease, on the 2012 film Mud.

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"Look, I'm not going to trivialize that situation, I just heard about it for the first time," the actor revealed. "But I always told [director] Jeff Nichols this, look in 'Mud,' the whole trailer for 'Mud' could be Sam Shepard sitting in that green chair telling the boy about who Mud is. It would be about a two-and-a-half minute trailer, but it would have been really badass."

"We lost one of the great ones. Great writer, great mind," he said, still digesting the news. "Alright, see you in the next one, Sam."

Shepard's biggest role as of late was his important turn as the late patriarch of the Rayburn family on Bloodline.

The actor is survived by three children and two sisters.

Photo Credit: Twitter / @Variety