The Punisher series is moderately close to the comic. Some key elements and storylines are retained, but there are also some variations to adapt to the medium of TV or film.
Well, Frank Castle was once a normal family man and a veteran. He served in the military, which gave him all kinds of combat skills. But then, his family got caught in the crossfire of a mob - related shooting in Central Park. Losing his wife, kids, everything in one fell swoop. This shattered his world and led him to take the law into his own hands as the Punisher. He uses his military know - how to hunt down and punish those he deems guilty in the criminal underworld.
Sure, Frank Castle has ended up in prison in the comics. It usually happens as part of the complex storylines and his battles against the criminal underworld.
One of the best is 'The Punisher: Born'. It delves deep into Frank Castle's origin story, showing his transformation from a military man to the Punisher. The gritty art and intense storytelling really bring out the essence of the character.