She first appeared in PunisherWar Zone #7, as a police officer attempting to catch a serial rapist plaguing Central Park. Frank Castle / The Punisher is in the park as well, taking down targets of opportunity as well as being aware of the rapist. They both confront the criminal, but he escapes. Lynn and Frank team up and confront the rapist, plus several international assassins, in multiple incidents. The rapist dies in the crossfire. Lynn is wounded and as she is being treated, she plants a kiss on Frank. The fact that she worked with the Punisher becomes common knowledge. Later, Frank asks for help in tracking down an organization that is kidnapping people and stealing their blood, supposedly being 'safer' for medical use. Lynn kills the leader, Mr. Sandeen, when he gets the drop on Frank, Ghost Rider and Matt Murdock / Daredevil. Feeling that she had crossed the line again, she breaks down. Lynn and her partner confront a suspected thief, Clyde Allen Durkin, in his home. They discover evidence indicating that he has murdered several children. However, all of it is ruled inadmissible due to warrant problems. Disgusted, Lynn leaves the force. Frank Castle apparently kills himself in a bomb that takes out a mobster's meeting. A government task force that targets vigilantes, called VIGIL, targets Payback. He is Eddie Dyson, an ex-police officer trying out vigilantism in response to the murder of his family by mobsters. Lynn rescues Payback from VIGIL.
Vigilante murders
Through a "gift" of cigarettes, Lynn causes Durkin to look out his cell window, and she kills him with a sniper rifle. Lynn and Eddie agree to a temporary partnership to take down VIGIL. As part of this agreement, they allow themselves to be arrested after they destroy a Mafia-run numbers racket. Blackwell, a power-mad VIGIL officer, beats Eddie and Lynn. The two manage to escape. Blackwell murders the straight-arrow officer Jessup and frames the two vigilantes. Eddie and Lynn travel to the town Laastekist, where many agencies, including the Mafia, now know the Punisher is located. Despite his injuries, Eddie assists Lynn in killing several Valducci mob agents. However, members of the Cullen mob badly injure Lynn. Eddie gets her medical treatment and they escape the town. Later, now healed, Lynn breaks into VIGIL headquarters looking for Blackwell, seemingly unaware he is now dead, having been killed by Castle. She rescues the sheriff of Laastekist, Harry Bendix, unjustly imprisoned by VIGIL. Two officers, Einhorn and Nails, allow them to escape.
Escaping the city
After killing drug dealers, an old colleague figures out that Lynn is the infamous 'Lady Punisher'. Mob leader Rosalie Carbone sends 'Mondo Pain' after Lynn and consequently, Bendix, who is injured in the fight. Lynn leads Pain away. In the ensuing confrontations, she gains what she believes to be the Punisher's personal diary. She is despondent to find that she's not mentioned in it and burns it. She decides that Castle's life is not for her. For survival's sake, she hooks up with Eddie. Lynn's father assists in bringing the two to a safe-house far outside of the city. A later sequence seems to indicate that the three of them are living peacefully at their intended destination, but it might have been Frank Castle's dream. Lynn later works as a deep-cover agent for S.H.I.E.L.D.. She works as 'Diamonelle' from the inside of an organization headed by Jigsaw. She shoots the Punisher's newest ally, Stuart Clarke, for being a cop killer. After Jigsaw is arrested, Lynn allows an ally to kill Jigsaw. She is then taken into custody.
Abilities and training
Lynn is a trained law-enforcement officer which includes proficiency at unarmed and armed combat with various firearms. Like the Punisher, she is not averse to using guns in her war against crime. She wears a Punisher-inspired Kevlar costume.
