Leslie Jordan was about to do what he loved, acting and making people laugh, in his final moments -- he was on his way to set when he died behind the wheel ... TMZ has learned.
Sources close to the late actor tell us Leslie was scheduled to film for "Call Me Kat" Monday morning, but people working on the show became concerned when Leslie hadn't arrived more than an hour after his call time.
While it's unclear if that appointment would have discovered any underlying health issues for Leslie, investigators' current operating theory is he suffered a heart attack while driving.
Leslie's "Call Me Kat" costar Mayim Bialik posted a sweet tribute to the actor, writing, "They broke the mold when they made Leslie Jordan. He was a dear mentor and a beloved friend. I will miss him so much - it’s unimaginable that he’s gone. Rest well, sweet buddy."
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Production for the show has been paused in the wake of Leslie's death.