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What sort of time period - was it a one shot or series - so far the only thing I can find is Plutona which the body is a woman, there's no offical investigation and existence of superheroes are general knowledge
That does seem pretty similar, jormis (and it does seem like an interesting comic, thanks for the suggestion), but it's not what I'm looking for - the comic was a graphic novel-type one shot, not a bound collection of a series, something around 200 to 300 pages, and the existence of superheroes is not common knowledge (and, since I haven't read the book itself, might turn out not to be real at all). I'm not sure about the time period, but the 80ies vibes were pretty strong, with the idea of the 'superhero' having a golden age in the 50ies when he was young.
A comic about a group of small town kids who discover the town eccentric, a homeless man wearing a makeshift superhero costume, dead. As they don't believe the official explanation that he die due to drug or alcohol overuse, they investigate, and discover the old man might've been a real superhero. I haven't read it and don't know how it ends, but that does seem to be what the comic implies.
From what I could tell, the comic was like a subversion of superhero stories, in the mold of Powers or Flex Mentallo, but also has elements of Amblin-inspired "kids riding bikes discover old secrets" stories.
I'm not sure about the title format, but I think it was something like "Who Killed" or "The Death of" and the superhero name, "captain (something)" or "(something) man", although I might be wrong.
Edited by Mac_R