【Uschi Karnat】

Alan Thicke,Uschi Karnat who rose to stardom on the popular sitcomGrowing Pains, has died at age 69.

"Alan's sudden passing has been confirmed," a publicist for the actor told Mashable. "At present, we have no further details. We appreciate your interest and when we have additional information, we will make it available."

The death was first reported by TMZ. Later, a publicist for the actor's son told the Associated Press that Thicke died of a heart attack in Los Angeles.

Thicke most recently appeared on Fuller House on Netflix and NBC's This Is Us.

Several celebrities mourned his passing on social media, including Bob Saget, whom Thicke gave a shoutout to on Twitter just hours before his passing.

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Thicke was not only an actor, but a composer too, writing the theme songs for Diff’rent Strokesand The Facts of Life. He also hosted a late-night talk show, Thicke of the Night, for one season starting in 1983.

Born in Ontario in 1947, Thicke got his start as a Canadian talk show host. Recently, his son, Robin Thicke, had gained fame as a pop star.