A Franklin County jury has found a Columbus teenager guilty of killing a 15-year-old from a rival gang behind a South Linden duplex last year. The Common Pleas jurors deliberated for two hours this afternoon before concluding that Jesean M. Callender, 17, gunned down Kaewaun D. Coleman on Jan. 17, 2013, as a crowd gathered for a fight in an alley behind 2055 Cleveland Ave.