Mulligan studied English at McMaster University in Hamilton, Ontario. She started at Citytv in the CityPulse library. Before moving over to CityNews, she was a news writer for Breakfast Television. Mulligan has also been an ENG Cameraperson and a videographer. She added the duties of anchoring CP24 in January 1998 until 2008 when CTVglobemedia acquired the channel.
Mulligan has two daughters. In April 2010, she was diagnosed with breast cancer. She announced the diagnosis publicly in May 2010, and has since reported on and blogged about her experiences of treatment.
- "CityNews.ca - Toronto's News - Personalities". citytv.com. Retrieved 12 December 2010.
- "CityNews Gets 3 Gemini Nominations - CityNews". citytv.com. Retrieved 12 December 2010.
- Anne-Marie Tobin (June 8, 2010). "Battling cancer in the public eye: reporter, actor tell their stories". Toronto Star. Retrieved December 12, 2010.
- "Statistics confirm cancer is now the leading cause of death for Canadians -". 680News. May 19, 2010. Retrieved 12 December 2010.
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