Walter Hardy, adopting the alias Detective Mackey, appears as a side character in The City That Never Sleeps downloadable content for Marvel's Spider-Man. A former cat burglar, he is the father of Felicia Hardy, who adopted the costumed identity of the Black Cat after deciding to follow in his footsteps.
Walter Hardy is the father of Felicia Hardy. He became a cat burglar at some point, calling himself the Black Cat. His skill as a thief eventually caught the interest of the Maggia, a powerful crime syndicate. When Walter refused to join the Maggia, he let himself get arrested in an attempt to avoid the Maggia's resulting wrath. Knowing that the Maggia would target his daughter to get to him, Walter escaped from Ryker's, faking his death and creating a new identity.
Finding Spider-Man's contact information, NYPD's Detective Mackey of the Greenwich precinct asks for the wall-crawler's assistance in tracking down paintings that were stolen by Walter during his time as the Black Cat. As Spider-Man looks for the paintings, Mackey relays Walter's backstory to the hero. After recovering the paintings, Spider-Man returns to the precinct and discovers from the detective's disappearance that Mackey is actually Walter, who faked his death and took on an alias to ensure that the Maggia wouldn't go after his daughter. Before he leaves, Walter asks Spider-Man to take care of the new Black Cat.
Felicia Hardy is Walter's only daughter, as well as his only known family. Walter deeply loves and cares for his daughter, wishing in his youth that she would not follow in his footsteps. After he faked his death to protect her, Felicia was left to believe that her father was actually gone. When she grew up, she decided to follow in her father's footsteps, becoming the new Black Cat. Upon examining her work and how she improved upon his abilities and equipment, Walter admitted that she was the better burglar.
Walter Hardy's character first appeared in Amazing Spider-Man #194 (July 1979).