Lady Cop

The Lady Cop is a fictional police officer, a comic book character published by DC Comics. She debuted in 1st Issue Special #4, (July 1975), and was created by Robert Kanigher and John Rosenberger.

Origin
Lady Cop is Liza Warner, a young woman who watches from beneath a bed as a murderer in cowboy boots decorated with the skull and crossbones, slaughters her two roommates, leaving the ace of spades behind as his calling card. Later a policewoman (circa 1975) praises her eidetic memory, calling her "natural police". Deciding that she will never be able to rest until she finds the murderer, Liza enrolls in the unnamed metropolitan city's police academy. At her academy graduation ceremony, Liza disarms a madman carrying a primed grenade.

Poisoned Love
In the book's main story Liza foils the attempted rape of an underaged girl, and then disables and arrests the two assailants after they attempt to sexually assault her. She later disarms a switchblade wielding madman and performs cardiopulmonary resuscitation on a stabbing victim. Later she counsels a panicky young woman on the dangers of sexually transmitted disease, helps the girl to reconcile a relationship with her dock worker father, and finally fends off an attack by a chain wielding gang member who'd been stalking her all day and saves him from drowning. In the issue's final panel Liza wonders if she will ever find the mysterious "Killer in Boots".[1][2]

All-New Atom
Liza Warner returned to the DC Universe in the pages of All-New Atom #6 and #11, now having become Chief of Police for Ivy Town. She advises and assists the new Atom Ryan Choi.[3]