History
Bullseye was an assassin trying to kill Daredevil, and his master Stick.
Bullseye eventually found Stick, and tried to kill him, but he was stopped by Daredevil, and sent to jail.
Bullseye was later hired by Kingpin to kill Matt Murdock after he learned he was the Daredevil, but decided he was more interested in killing Kingpin's Hand army instead of a blind lawyer, ending up helping Daredevil instead.[1]