heather laurie holden (born december 17, 1969) is an american- canadian actress and human rights activist. she is the daughter of actors lawrence holden (aka glenn corbett) and adrienne ellis. her stepfather is british director michael anderson. laurie was born in los angeles and raised in toronto. she began her career when she played rock hudson's daughter in "the martian's chronicles" (1980). her best known roles are "marita covarrubias" in the movie/series "the x-files" (1996-2002), olivia murray in "the shield" (2008), and "andrea" in "the walking dead" (2010-2013). she co-starred with jim carrey in "the majestic" (2001), played cybil bennett in the horror movie "silent hill" (2006) and amanda dunfrey in "the mist" (2007). in 2014, she starred to the comedy "dumb and dumber to", alongside jim carrey, jeff daniels and kathleen turner. in 2015, she appeared as dr. hannah tramble, an er surgeon, in the third season of "chicago fire". it was announced holden would reprise her role as dr. tramble in a planted spinoff, "chicago med". holden will co-star opposite epatha merkerson and yaya dacosta in the ensemble medical drama. the series is being conceived and written by "chicago fire" creators/executive producers derek haas and michael brandt.