As a child, Matt Murdock was blinded by radioactive waste while trying to save an elderly stranger about to get hit by a truck carrying the dangerous material. In turn, his other senses were heightened to superhuman sharpness and he gained a form of "radar sense". By day, he is a successful trial lawyer; but by night, he guards Hell's Kitchen as Daredevil: the Man Without Fear.
By the late 1990's, it was decided that Daredevil should receive a "soft reboot" alongside the other Marvel street level characters, collectively dubbed "Marvel Knights". This proved popular, and led to a slew of new Daredevil books, as well as several critically acclaimed comic runs.