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Zhang Ronggao (R), father of visiting Chinese scholar Zhang Yingying, steps out of a vehicle near the Federal courthouse building in Peoria, Illinois, the United States, on June 3, 2019. Trial of Brendt Christensen, accused kidnapper and killer of visiting Chinese scholar Zhang Yingying in 2017, began on Monday at 9 am local time (1400 GMT) at a Federal courthouse in Peoria. (Xinhua/Wang Ping)