If you know Klugman at all, it's likely from the TV series The Odd Couple. Or maybe his four appearances on The Twilight Zone. Or Quincy M.E. Or the movie Twelve Angry Men. Or a bunch of other stuff. My favorite performance by him is opposite Jonathan Winters in the amazing TW episode "A Game of Pool", which you can watch inthreeparts on YouTube.
Rest well, Mr. Klugman, and thanks for all the drama, and all the laughs.
The first thing I remember seeing him in was The Odd Couple. Then I saw him in A Game Of Pool, wonderful episode. I do remember him in Quincy but I didn't watch that show too often. I know that I have seen the classic Twelve Angry Men but don't remember him in it (then again, I don't think that I can remember any of the twelve actors who were in it). He will definately be missed.
One of my favorite memories of him is a guest appearance he did on Match Game; as Gene came around to do introductions, he informed the audience "Brett said I didn't have to pay alimony this month if I covered for her."
"A Game of Pool" is great, and while Klugman is great in it, getting to see Winters in a serious role is also a relatively rare treat. But let's give some credit also to the creative mind behind that story, who is still with us - George Clayton Johnson. He also wrote several other TZ episodes, the Star Trek episode "The Man Trap" (salt vampire!), and the story on which "Ocean's Eleven" was based. In addition to co-writing the novel Logan's Run with William Nolan.