John Mahoney, the beloved dad on "Frasier," has died in Chicago ... TMZ has learned.
According to John's publicist ... he passed away Sunday in hospice care.
John most recently had a recurring role in "Hot in Cleveland." Besides his TV success, John was in tons of movies -- like 'American President,' "Say Anything..." and "Eight Men Out" -- during more than 30 years in show biz.
He won a SAG Award in 2000 for "Frasier" -- and was nominated for 2 Emmys and 2 Golden Globes. John was also active in theater, and won a Tony in 1986.