Macaulay Culkin shares an emotional tribute to "Home Alone" co-star Catherine O'Hara following her death, posting a heartfelt message on Instagram.

Catherine O'Hara has died at 71. The Emmy-winning actor was known for her roles on “SCTV,” “Schitt's Creek,” and the two “Home Alone” films.

O'Hara, who died on January 30, had a career spanning 50 years, including iconic roles in "Schitt's Creek" and "Home Alone."

O'Hara played Kate McAllister, the mom of Kevin McAllister, portrayed by Macaulay Culkin, in the hit 1990 movie "Home Alone." O'Hara's character famously made a treacherous trip home after she and her husband discovered they'd left their son at their house alone on a Christmas family vacation to Paris.

Macaulay Culkin remembered his "Home Alone" co-star mama Catherine O'Hara on Instagram, shortly after her death was announced Friday at the age of 71.

Macaulay Culkin is devastated over the death of his Home Alone mom Catherine O’Hara, whose sudden passing has opened some very raw wounds for the 45-year-old actor. “Catherine was so much more to Mac than just a costar,

Culkin once said that he called O’Hara “mom," even decades after 'Home Alone'

Actor Catherine O’Hara, best-known for roles in “Schitt’s Creek,” “Home Alone,” “Beetlejuice” and other TV and film productions, has died at age 71.