Joosten, who had battled lung cancer for 11 years, died on Saturday at her home in Los Angeles, her publicist Nadine Jolson said.
Joosten "was surrounded by love and humour 'til the end," her family said in a statement. "We are laughing through our tears."
Joosten won two Emmy awards for her portrayal of Mrs McCluskey, who kept a close eye on her Wisteria Lane neighbours on Desperate Housewives. The hit show ended its eight-year run on ABC last month with a series finale in which Joosten's character passed away. Her character's battle with cancer was a story line in the show.
Joosten's Desperate Housewives co-stars took to Twitter to express their condolences.
"Rest in peace, she was an amazing woman and a wonderful actress," Felicity Huffman wrote.
Brenda Strong said in a tweet: "Wisteria Lane won't be the same without you."Acting career
Joosten was a psychiatric nurse and single mother in suburban Chicago when she began her acting career at 42. She wrote on her website that she pursued her childhood dream of acting after getting involved with her hometown theatre in Lake Forest, Illinois.
She said she received her first break when she was hired to be a street performer at Disney World in Orlando, Florida. She worked odd jobs to make ends meet and moved to Hollywood in 1995. She said she landed her first small role within months on the comedy Family Matters.
Over the years, she found steady work appearing in such popular shows as Dharma & Greg, Ally McBeal and Scrubs. She became a familiar face to fans of NBC's The West Wing when she appeared as Dolores Landingham, President Jed Bartlet's trusted secretary.
"Some people in Hollywood think of me as a model for dramatic midlife transitions: suburban housewife to Emmy-winning actress," she wrote on her website. "But I never plotted a master plan for following my dreams."
Joosten was an advocate for lung cancer awareness and research and sat on the board of governors for the Academy of Television Arts and Sciences.
Active in animal rights causes, she appeared with other celebrities at a 2008 news conference in Los Angeles to ask the city to abandon a project for a $40 million elephant enclosure at the Los Angeles Zoo.
She is survived by her sons, Jonathan and Timothy.
Plans for a memorial service were pending.
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