In the first season of "Daredevil", Karen discovers evidence that Union Allied's pension fund is being used by Wilson Fisk to launder criminal money. In response, Fisk has her framed for fatally stabbing a coworker, Daniel Fisher, in her apartment, and intends to have a lawyer on his payroll approach Karen to extort her into giving up her copy of the pension file. However, Matt and Foggy show up and agree to take Karen on as a client thanks to a tipoff from Brett Mahoney. As a result, Fisk instead settles for trying to kill Karen, first by having James Wesley intimidate a guard into trying to hang Karen in her jail cell, an attempt that fails when Karen fights back, drawing blood from one of the guard's eyes. Undeterred, he makes a second attempt by sending an assassin to Karen's apartment to attack her when she sneaks out of Matt's apartment to retrieve the pension file, but Matt saves her and delivers the pension file to the "New York Bulletin" so that Union Allied's criminal dealings are publicly exposed. Feeling indebted to Matt and Foggy for getting her out of jail, Karen offers to work for them as Nelson & Murdock's secretary.