In Marvel Comics, Frank Castle used to be a policeman; but after his wife and child were shot to death, he left the force forever and became the mass murdering vigilante The Punisher.
Frank Sinatra | castle | Frank Zappa | Frank Lloyd Wright | Windsor Castle | Frank Capra | Frank Gehry | L. Frank Baum | Castle | Frank Stella | Frank | Edinburgh Castle | Frank Herbert | Frank Wedekind | Balmoral Castle | Anne Frank | Castle (TV series) | Frank Loesser | Prague Castle | Frank Langella | Frank Whittle | Castle Donington | Frank Keating | Frank Lautenberg | Corfe Castle | Castle Hill | Frank McCourt | Castle Hill, New South Wales | Powis Castle | Frank Vincent |
Punisher Kills the Marvel Universe is a 1995 one-shot comic book written by Garth Ennis and illustrated by Doug Braithwaite with most inking done by Michael L. Halblieb, which depicts a story where Frank Castle kills every superhero and supervillain in the Marvel Universe including himself.
In the X-Men crossover Age of X, another universe's General Frank Castle commands a mutant-hunting version of the Avengers.