- Holds a third-degree black belt in Tae Kwon Do, and a second-degree black belt in Karate. She is also a licensed bodyguard.
- Speaks five languages: English, Ukrainian, French, Russian, and Italian.
- Began studying martial arts at the age of seven, and earned her first black belt at age 13. She opened her first dojo, Win Kai Martial Arts, at age 16; it has since expanded to three locations in Toronto and New York.
- Won silver medals at the Canadian National Tae Kwon Do finals.
- Did not begin speaking English until age eight.
- Known to her family as Katrusia.
- Of Ukrainian descent, parents Roman Winnicki and wife Lesya were both born in West Germany, where their families left to escape the USSR. When they were children, they moved to Canada. Her mother is Vice-President of the Ukrainian-Canadian Congress. Her father's parents were from Boryslav and Staryi Sambir. Her mother's family was from Galicia, with her maternal grandfather born in Ternopil Oblast and her maternal grandmother born in Lviv Oblast. They were all from the Soviet Socialist Republic of Ukraine.
- Her brother Adam fought in Afghanistan as a Canadian soldier.
- She and her three siblings dropped the final vowel from their birth name "Winnicki".
- Original family name means "winemaker".
- Was born in Etobicoke, Ontario, Canada, now part of Toronto.
- Graduated from Richview Collegiate in Etobicoke, Ontario, Canada, which is known for several other notable alum such as former prime minister Stephen Harper and MLB star Joey Votto.
- Her brother Mark Winnick is also an actor.
- She is a popular choice among DC comics fans to play the role of Dinah Lance/Black Canary in a live-action film.
- Was handpicked from thousands of aspiring young actors to be featured in the initial season of Bravo's popular documentary TV series, The It Factor (2002).
- Has appeared in all three "CSI" shows.
- Chosen by "Vanity Fair" to appear in the magazine's high-profile and highly-selective "Vanities" section in September 2009.
- Studied acting at New York's William Esper Studio.
- In 2015, Winnick stated she is "an American citizen as well as a Canadian" citizen.
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