Celebrities on Monday reacted to the death of "Odd Couple" star Jack Klugman, who died Monday at age 90. Here are samples of sentiments expressed on Twitter:

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"R.I.P. Jack Klugman, Oscar, Quincy a man whose career spanned almost 50 years. I first saw him on the Twilight Zone. Cool guy wonderful actor." — Whoopi Goldberg.

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"You made my whole family laugh together." — Actor Jon Favreau, of "Swingers," ''Iron Man" and other films.

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"I worked with Jack Klugman several years ago. He was a wonderful man and supremely talented actor. He will be missed" — Actor Max Greenfield, of the "New Girl" on Fox.

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"So sorry to hear that Jack Klugman passed away. I learned a lot, watching him on television" — Dan Schneider, creator of Nickelodeon TV shows "iCarly," ''Drake and Josh" ''Good Burger," ''Drake & Josh."

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