The news that actor Alan Thicke passed away at the age of 69 from a heart attack has seemingly shocked the world-with fans, co-workers and other celebs, family and more all taking to social media to share their heartbreak over his death.

Thicke was an actor who turned up in almost every project fans could watch him in, in guest-starring roles either as a new character or himself, with appearances in recent years on How I Met Your Mother and Scream Queens. This Fall alone, he appeared in a single episode of This Is Us as himself, and one of Fuller House, as a character named Mike. He also is known for his work on The Bold and the Beautiful and Growing Pains, among so many other projects.

His co-stars from these projects have all taken to social media to share their sadness over his passing, from the cast of Fuller House:

From This Is Us:

From Scream Queens:

From Growing Pains:

He was also remembered by others as well, including his ex-wife, Gloria Loring, as well as his son, Carter:

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