Garou has beaten many heroes, but some of them at least in their first beating survived, such as Tank Top Vegetarian. Which heroes beaten up by Garou died?
As far as I know, no hero that Garou defeated ever died in the manga. As noted here:
Although Garou is a villain and considered evil by most, he possesses a sense of morality: he fights heroes in a way without killing them, but he is okay with others killing heroes.