Katherine Helmond Passed Away!

Katherine Helmond passed away.

A true legend in entertainment.

She will be missed.

Katherine Helmond joined former #WhosTheBoss costars in 2016 for a cast reunion. See the sweet photos: https://t.co/5w0w3dXaDs pic.twitter.com/ASOBxY8bIi

— Entertainment Weekly (@EW) March 1, 2019

Katherine Helmond, who was best known for her roles as Mona Robinson on Who's The Boss? and Jessica Tate on the dramedy Soap has passed away after complications with Alzheimer's disease.

Helmond starred in the hit sitcom Who's The Boss? from 1984 until 1992 as well as roles in Coach, Everybody Loves Raymond, Overboard, Soap and Brazil. She also had a voice role in Cars and even had a role in Alfred Hitchcock's Family Plot.

Activist and entertainer Alyssa Milano responded to the news.

Katherine Helmond has passed away.

My beautiful, kind, funny, gracious, compassionate, rock. You were an instrumental part of my life. You taught me to hold my head above the marsh! You taught me to do anything for a laugh! What an example you were!

Rest In Peace, Katherine. pic.twitter.com/HNIH0Ty6MN

— Alyssa Milano (@Alyssa_Milano) March 1, 2019

In celebration of Katherine Helmond and her brilliance! https://t.co/vaepWn2bpx

— Alyssa Milano (@Alyssa_Milano) March 1, 2019

💔 pic.twitter.com/0TzVITSik5

— Alyssa Milano (@Alyssa_Milano) March 1, 2019

😭😭😭 https://t.co/koaw1SoQ3j

— Alyssa Milano (@Alyssa_Milano) March 1, 2019

Oh. My. Goodness. Thank you, @JonLionFineArt. https://t.co/CCPM6qYVgb

— Alyssa Milano (@Alyssa_Milano) March 2, 2019

Danny Pintaruo responded to the news through his social media account.

We lost one of the most genuine and kind people I have ever known. There's not a single person who can say otherwise - she was always smiling, full of heart, and had the best advice. I couldn't have asked for a better grandmother and I will miss her so dearly. pic.twitter.com/0fapCPQWuV

— Danny Pintauro (@dannypintauro) March 1, 2019

Judith Light also shared her remarks on her former co-star who was like a mother figure to her.

Katherine Helmond was an inspiration to me and so many others
Her grace, talent and humor will be deeply missed
She is in my heart forever

— JudithLight (@JudithLight) March 1, 2019

Tony Danza, the star of the sitcom also responded.

We all lost a national treasure today. No words can measure my love. pic.twitter.com/eGTf6Ovt3f

— Tony Danza (@TonyDanza) March 1, 2019

"[Katherine] was such an influence on me. From being a single guy with a hit show in Hollywood, through my marriage and having kids -- she was with me. No matter what problem I had, I could go to her. Very few people could match her."

Katherine leaves behind her husband of 57 years David Christian. She was previously married to George N. Martin.

"She was the love of my life. We spent 57 beautiful, wonderful, loving years together, which I will treasure forever. I've been with Katherine since I was 19 yeas old. The night she died, I saw that the moon was exactly half-full, just as I am now....half of what I've been my entire adult life."

During her five-decade career, Helmond was nominated for multiple Emmy Awards and won two Golden Globes for the Jessica Tate role on Soap and Mona role on Who's The Boss?