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Former costars react to the heartbreaking death of Mary Tyler Moore

They truly cherished her.

Mary Tyler Moore, the groundbreaking actress behind some of the most progressive roles of all time, passed away yesterday at the age of 80.

It's no secret Moore was beloved by everyone in Hollywood. New generations of actors looked up to her, and she remained close with her costars from The Dick Van Dyke Show and The Mary Tyler Moore Show, as well.

Since the news of her death was first reported, tributes have been pouring in from her former costars and those who knew her best.

Here's what they had to say.

Ed Asner, Moore's costar on The Mary Tyler Moore Show, was one of the first to share his thoughts on her passing.

Dick Van Dyke gave Moore her big break by featuring her on The Dick Van Dyke Show. He had this to say on Twitter.

This morning, Van Dyke talked to CBS This Morning.

Cloris Leachman told us who the "real" Mary was.

"A line from our theme song was 'Love Is All Around,' and that's what it was for five days a week for seven years straight on the Mary Tyler Moore set," Gavin MacLeod told PEOPLE. "It was all because of Mary! She was professional; she was extremely creative with a terrific sense of humor and a gifted actress.

Georgia Engel told this to Us Weekly, "She was my beloved friend, I loved her very much. She helped launch my career. She will be missed greatly."

Moore's costars weren't the only ones to pay tribute to the iconic actress.

Carol Burnett, another funny woman of the 1970s, had this to say in a statement:

"She will be so missed. She was a pioneer on television and also one of the sweetest, nicest people I ever knew."

Bob Newhart, whose own eponymous show was produced by MTM Enterprises, had this to say to NBC News:

"You're going to be hearing Mary's voice in female actresses in comedy forever. She was that big an influence."

Barbara Eden had her starring role on television around the same time as Moore. She had to say this.

Minnesota Senator Al Franken even joined the chorus of tributes, as the show took place in Minneapolis.

Humans weren't the only one giving thanks to the television icon.

Here's to you, Mary Tyler Moore! Rest in peace.

MeTV will honor the legacy of Mary Tyler Moore by airing six classic episodes of The Mary Tyler Moore Show on Sunday, January 29, beginning at 2PM | 1C.

Check out the episodes we'll air here, including the series premiere, "Chuckles Bites the Dust" and the iconic series finale.

Love memorable entertainment? Find out where to watch MeTV