Plot summary
When Fisk learns that Matt survived the submerged taxi, he tells the FBI that he has a criminal fixer named Matt Murdock. Karen confronts Fisk's actual fixer, Manning, but he threatens her with his knowledge of her family, including her brother's death. Nadeem questions both Karen and Foggy about Matt, and both try to direct him towards Fisk and his crimes. Fisk reviews a file from Manning on Dex and learns that he used his skillful aim to kill his baseball coach as a child. He was taught to be more empathetic through therapy as he grew up, but he feigned this to conceal his psychopathic tendencies.
In one incident when he worked for a suicide prevention hotline, he encouraged a caller to kill someone else rather than himself. It was there that he met and fell in love with Julie, whom he now finds working at the hotel. He accidentally reveals to her that he has been stalking her. Fisk sees the potential for Dex to become the new villain that the public can focus on in order to misdirect attention from himself. Karen reveals to Foggy that she killed James Wesley.
Credits
Adapted from Wikipedia contributors, Daredevil season 3. HTML formatting and reference markers removed.