In Daredevil: Born Again episode 4, we learn that Vanessa Fisk had an affair with Adam during the time that Wilson was away. At the end of season 3, Wilson ended up incarcerated before he appeared again in both Hawkeye and Echo, even being shot in the head at the end of the latter show.

Though you may have figured this out already, the closing credits of Daredevil: Born Again appear to leave little doubt as to the identity of the serial killer known as