He was 69.
Carleen Donovan, who is a publicist for Thicke's son, singer Robin Thicke, says the actor died from a heart attack on Tuesday in Los Angeles. She had no further details.
Thicke was most well-known in his popular role of Dr. Jason Seaver in '80s ABC sitcom "Growing Pains."
If you're viewing on our ABC13 news app, tap on the photo above to see more images.
Thicke had a son and daughter. Thicke's son Robin is a well-known R&B performer.
Alan Thicke was a musician himself, credited as the composer for theme songs to popular sitcoms such as "Facts of Life" and "Diff'rent Strokes."
So sad is the passing of Alan Thicke. Such a good husband, father, brother, and friend. He will be deeply missed. Rest in peace dear Alan.— bob saget (@bobsaget) December 14, 2016
Thicke's Twitter account was active as recent as 4 p.m. Tuesday afternoon about his guest role in Fuller House.
In 1988, Alan Thicke joined with Jan Glenn and Don Nelson to host the ABC13 coverage of the Foley's Thanksgiving Day parade.
Alan Thicke's death sparked an instant outpouring of mourning and support on social media.
IN MEMORIAM: Celebrities and notable figures who have recently passed away
The Associated Press contributed to this article.
Keep checking back on this page to get real-time updates as this story unfolds. To get alerts for breaking news, download the ABC13 news app for iPhone or Android. You can also get breaking news alerts sent to you by email.