Leland Owlsley was a wall-street wizard and got the nickname Owl by his peers. The IRS started snooping and revealed his ties to the underworld. Depressed, he took a serum that gave him the ability of flight. He has had several clashes with Daredevil, Spider-Man, Black Widow, and even Doctor Octopus. Through the years, the serum has caused him to mutate further. He has recently resurfaced to take revenge on Daredevil. The Hood later seemingly killed Owl in order to gain respect among the figures of New York's criminal underworld and steal Deathlok from him.
Later, it turns out Owl survived the attack, as he is under police custody, but gets freed by Kingpin's henchmen shortly - in return, Wilson Fisk wants Owlsley's services in order to distract Daredevil and takeover The Hand. That leads to the capture of Dakota North, who Owl plans to torture, but his plot gets ruined once again by Daredevil, who shows no mercy to his long-time nemesis - he cuts Owl's arms and legs with a sword, very likely crippling him by doing so. This also leads to the beginning of the Shadowland event.
Later, it appears that he is fully healed and is in possession of the head of Silvermane which Boomerang's Sinister Six tries to steal.
