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After marathon cheat’s suicide, man who busted him said he would do it again

The marathon detective who nabbed a cheating runner who later killed himself in shame says he’d do it again. “It was such an egregious case, I can’t imagine I wouldn’t have reported on it,” Derek Murphy told The Post. “But I ­always exercise caution. I look for true intent.” Sunday’s New York City Marathon recalls some of the darker chapters in the history of such grueling races, and the shortcuts that some seek in the quest for glory. In March, a 70-year-old retired physician named Frank Meza ran the Los Angeles Marathon and finished in an amazing two hours, 53 minutes and 10 seconds — a world record for his age group. But after online sleuths, including Murphy, questioned Meza’s time based on his race history, ...