O’Hara, who played Culkin’s mom Kate in the films, died at her home in Los Angeles “following a brief illness,” according to a statement from her agency, Creative Artists Agency. The actress’ cause of death has not yet been revealed.

The late Catherine O'Hara had trouble saying a particularly venomous line to a young Macaulay Culkin in the first Home Alone movie.

Just moments after news of "Home Alone" star Catherine O'Hara's passing, her co-star Macaulay Culkin posted a heartfelt tribute on social media to his movie "mama."

The cast shared their shock over the star's sudden passing.

Macaulay Culkin has taken to Instagram to pay tribute to Catherine O’Hara, the beloved comedic actress who played his mother in the Home Alone films, who passed away on Friday, aged 71. “Mama. I thought we had time,

Catherine O'Hara, beloved "Schitt's Creek" and "Home Alone" actress, has died at 71. No further information is known about her death at this time.

While the "Home Alone" franchise may be lighthearted and family-friendly, these former stars from the movies managed to get into hot water legally.

It’s a death that’s sending shockwaves throughout Hollywood. And that’s because Emmy Award-winning actress Catherine O’Hara, best known for her legendary comedy roles in ‘Schitt’s Creek,’ ‘Home Alone,