Get the tissues out, people.
As you have probably heard, Alan Thicke passed away at the age of 69 on Tuesday after suffering a heart attack.
Many celebs came to show the actor their love on Twitter and Instagram, but it really hit home when his former Growing Pains costars paid tribute.
Related: Alan's Sons Robin & Carter Comment On Their Dad's Death
Kirk Cameron shared an emotional message from himself and wife Chelsea Noble, who also starred on the show, with a throwback picture of them on set:
Tags: alan thicke, ashley johnson, chelsea noble, growing pains, instagram, joanna kerns, kirk cameron, r.i.p., sad sad, twitter