Gerry Cooney had a great left hook to the body Mickey ward in modern times, Mickey Walker in days gone by Mike McCallum
Don't you mean livershot? I personally make a difference between standard bodyblows and livershots. A livershot is something you can onehit boxers with, normal body blows are damage by accumulation.
Roy Jones. He KO'd Glenn Wolfe early in his career with a body punch, but after he KO'd Virgil Hill, he was devastating. "Roy Jones Junior is the best body puncher in boxing. He can actually knock you out with a body shot" -George Foreman
Gerald Mclellan, Mickey Ward, JCC, Tony Zale, Lloyd Marshall & Jack Dempsey are a few names. I don't know if it's the one punch KO kind of power, but Kid Azteca has a reputation of being a terrific body puncher with a particularly vicious hook to the liver and, if the boxrec records are correct, he had more than 100 KO's to his name. I know nothing about him though.
chavez, gatti, frazier, tyson can be added to the ones already stated. riddick bowe could bang the body pretty well, just watch the bowe-holy 1 fight, more specificaly rounds 3 and 6
As far as the best and most brutal body Punchers...my top 3 would be Mike Tyson Tommy Hearns Joe Frazier
'I loved Williams' right uppercut, left, left, right on Gatica.' 'Don't you mean a four punch combo?' -- 'Hagler almost knocked down Caveman Lee with a jab.' 'Hmm don't you mean a power jab?' Get the **** out!