He was 82.
The Canadian-born actor was best known for playing band manager Reuben Kincaid on the 1970s sitcom.
Madden, who also appeared on the sketch comedy program "Laugh-In," was the author of several books, including a memoir published in 2007.
His other credits include "Alice," "Charlotte's Web" and "Camp Runamuck Counselor."
Notable deaths of 2014 [PHOTOS]