Mattie Storin
Mattie Storin (Susannah Harker) is a journalist for the fictional Chronicle, who becomes romantically involved with Francis Urquhart. She is killed at the end of House of Cards by Urquhart, who throws her off the fictitious roof garden of the House of Commons. She knew about his illegal actions and he did not believe that she would keep quiet about them.
In the series, she displays evidence of instability, most alarmingly her preference for calling Urquhart 'daddy' in moments of intimacy. This apparent Electra complex could be linked to her father's death when she was very young, an event revealed in To Play the King when Urquhart explains her 'sad' story to Sarah Harding when she is ordered to ask him by some homeless thugs. Aside from this kink, she is portrayed as a headstrong, talented, beautiful young woman who is determined to understand the way the Westminster Bubble works and even states that this is more important to her than getting 'scoop headlines'. The name for this character chosen by Michael Dobbs was based on Matthew Storin, a male journalist, who was a colleague of Dobbs at The Boston Globe in the 1970s and later became editor of the Globe (1993-2001).
Read more about this topic: List Of House Of Cards Trilogy Characters