4:15 PM -- HBO tells us they had scheduled Bob to part of season 10 of 'Curb,' but his health prevented it.

Larry David says, “Never have I seen an actor enjoy a role the way Bob did playing 'Marty Funkhouser' on 'Curb.' It was an amazing, unforgettable experience knowing and working with him. There was no one like him, as he told us again and again. We’re all in a state of shock.”

Bob Einstein, the Emmy-winning actor from "Curb Your Enthusiasm" and creator of Super Dave Osborne, died Wednesday from cancer.

Bob had recently been diagnosed, and he died at his home in Indian Wells, CA.

He famously played Larry David's pal, Marty Funkhouser, on 'Curb,' but he was a very successful comedy writer before that -- winning Emmy awards for being a writer on "The Sonny and Cher Comedy Hour" back in the '70s and for producing Dick Van Dyke's "Van Dyke and Company."

Bob's character, Super Dave, pulled crazy stunts decades before "Jackass" even existed -- but he would always hilariously fail. Super Dave had his own show on Showtime in the late '80s and early '90s.

Bob didn't start out in showbiz -- standing 6'4", he played college hoops at Chapman University and then got into advertising. He was "discovered" in the comedy world by Tom Smothers who saw Bob on a local cable show.

His younger brother is actor and director Albert Brooks. Deadline first reported Bob's passing.