How Catherine O’Hara went from Gilda Radner’s understudy to cultural icon with her own language as Moira Rose

Catherine O’Hara was never afraid to go big. The wild accent as Moira Rose on “Schitt’s Creek.” Delia Deetz’s possessed dance to “Day-O (The Banana Boat Song)” in “Beetlejuice.” The way she screamed “KEVIN!” in two “Home Alones” as Kate McCallister.

But it wasn’t boldness alone that made her one of the greats, and her characters memorable: No matter how absurd or how preposterous or even cliche on the page, there was always a beating heart underneath the silliness, a compassion that shone through.