Third generation Irish/Canadian/Catholic.

Gave a tearful eulogy at the funeral for John Candy.

Began working at Toronto's Second City in 1973 as a waitress. Her brother Marcus O'Hara, and sister Mary Margaret also had jobs there.

Became a U.S. citizen.

Went to the same high school as fellow Canadian entertainer Dave Foley.

Auditioned for the role of Jane Craig in Broadcast News (1987). Holly Hunter was cast instead.

Wrote "Second City TV" (1976)'s famous sketch "High-Q", considered one of the funniest sketches on "Second City TV" (1976).

Composed the two songs she and her sister Mary Margaret O'Hara and friend Robin Duke performed in The Last Polka (1985) (TV).

She was part of the group Northern Lights who sang the song "Tears Are Not Enough" which was on the "We Are The World" album.

Crowned Queen of Comedy after her years as a regular on "Second City TV" (1976), better known as SCTV. Catherine O'Hara has an almost religious cult following around the world.

Learned to play the autoharp for her role in A Mighty Wind (2003).

A close friend of actor John Candy.

Received a star on Canada's Walk of Fame in June 2007.

Sister of critically acclaimed singer/songwriter Mary Margaret O'Hara.

Sons names are Dylan and Matthew.

A high school friend of Robin Duke at Burnhamthorpe Collegiate in Etobicoke, Ontario, Canada. They first acted together in a school production of "Harvey".

Her sons were born in 1994 and 1997.

Owns a cottage (along with her husband Bo Welch) in Muskoka, Ontario.

Is one of 7 children.