[3] She graduated from York University with degrees in English and Mass Communications, as well as earned a diploma in Broadcast Journalism from Seneca College.

[4] When she was 19, Petrillo began volunteering at her local television station, Rogers Cable York Region in Ontario, Canada.

[citation needed] Petrillo joined Hockey Night in Canada for the 2011-12 NHL season and hosted the iDesk portion of the broadcast, becoming the first female to serve on a full-time basis with the HNIC studio team.

[citation needed] She anchored CBC's coverage of the 2014 Winter Olympics in Sochi Russia, and the 2014 FIFA World Cup.

On October 24, 2015, CBC Sports launched a new show, Road to the Olympic Games, which Petrillo co-hosts with veteran sportscaster Scott Russell.

[8] In September, it was announced that Petrillo and Adnan Virk would co-host the pre-game, intermissions and post-game portions of Prime Monday Night Hockey,[9] which launched with a game in Montreal on October 14, 2024.