2:39 PM PT -- The rest of the cast is now weighing in. Jason Bateman said, "R. I. P. Jessica Walter. What an incredible career, filled with amazing performances. I will forever remember my time with her, watching her bring Lucille Bluth to life. She was one of a kind. All my love and thoughts to her family."
Tony Hale called Jessica a force ... adding, "and her talent and timing were unmatched. Rest In Peace Mama Bluth."
2:18 PM PT -- Will Arnett is reacting to the news ... saying he'll miss his 'Arrested' co-star. He said, "Jessica Walter was a deeply talented person. We first met on a pilot in ‘96 and I was instantly blown away. I’m fortunate to have had a front row seat to her brilliance for 25 years."
He finished his tweet saying, "My thoughts are with her daughter Brooke and grandson Micah today. Farewell Jessica, you’ll be missed."
Jessica Walter, known for her Emmy-nominated "Arrested Development" role and whose acting career spanned 6 decades, has died.
The actress died in her sleep at her NYC home Wednesday ... according to her daughter, who did not announce the cause of her death.
Jessica's best known, and beloved, for playing the devious alcoholic socialite Lucille Bluth on 'Arrested.' She appeared in all 84 episodes during the series, from 2003 to 2019, and was nominated for an Emmy for Outstanding Supporting Actress in a Comedy Series in 2005.
She won an Emmy in 1975 for Outstanding Lead Actress in a Limited Series as the title character of the NBC miniseries, "Amy Prentiss." Jessica also got Emmy noms for roles on "Trapper John, M.D." and "The Streets of San Francisco."
True film aficionados will remember her role in Clint Eastwood's directorial debut in "Play Misty for Me." New school fans will recognize her voice as Malory Archer on the hit FX animated series "Archer."
Jessica is survived by her daughter, Brooke Bowman ... the Senior VP for programming at FOX Entertainment who said, "It is with a heavy heart that I confirm the passing of my beloved mom Jessica. A working actor for over six decades, her greatest pleasure was bringing joy to others through her storytelling both on screen and off."
Bowman added, "While her legacy will live on through her body of work, she will also be remembered by many for her wit, class and overall joie de vivre."
The family's asking that, in lieu of flowers, donations are made to Guide Dogs for the Blind.