Colantoni was born in Toronto, Ontario, the son of Gina, a garment worker, and Quintino Colantoni, a labourer and truck driver. Both his parents were immigrants from Abruzzo, Italy, and his brother, Det. Sgt. Hector Colantoni, is a retired police officer with the Toronto Police Service.
He attended the University of Toronto studying psychology and sociology, but transferred to the American Academy of Dramatic Arts in New York City. Colantoni graduated from the Yale School of Drama, winning the Carol Dye Award.
Colantoni starred in the TV series Remedy. He appeared on Just Shoot Me! as Elliot DiMauro from 1997 to 2003, and starred in the Canadian TV police drama Flashpoint as Sgt. Greg Parker (also airing in the U.S. on ION Television, and airing previously on CBS). His older brother, who was a Toronto policeman for the past 30 years, advised Colantoni on how to play the character. Colantoni played Keith Mars for four seasons on Veronica Mars, a role he reprised in the 2014 film and the 2019 Hulu revival.

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