King T. Leatherbury, a longtime horseplayer who brought savvy handicapping skills to picking the low-priced horses he trained in a Hall of Fame career spent mostly on Maryland tracks, died on Tuesday at his home in Mitchellville, Md. He was 92. His son Todd confirmed the death. Mr. Leatherbury — King was his mother’s maiden name — won 6,508 races, the fifth most wins among thoroughbred trainers in North American history. From 1974 to 1984, Mr. L…
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