She was born March 7, 1983, in Canada and graduated from Dalhousie University with a Bachelor of Arts.
Heafey starred in A Night for Dying Tiger (2010), Earthstorm (2006), Mordu (2007), and For Better or for Worse (Season 1 Episode 1-16 in 2000).
In "Exile on Main Street", Dean gets back into hunting and reunites with Sam.
At the end of the episode Gwen shows who she is loyal to when she holds the Winchesters at gunpoint.
In "...And Then There Were None", Gwen and the Campbells are investigating murders when they run into Bobby, Rufus, Sam and Dean.