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Chicago Mayor Anton Cermak was shot to death when a gunman tried to assassinate President-elect Franklin D. Roosevelt in Miami in 1933. Roosevelt was unhurt.
What we know so far about the suspected shooter, 20-year-old Thomas Matthew Crooks of Bethel Park, Pennsylvania. The attack could alter the tenor and security posture at the Republican National Convention, which will begin Monday in Milwaukee.
The event comes a day after Trump was injured while delivering a speech at a rally in Pennsylvania.
Someone opened fire into a crowd gathered in the 9500 block of South Merrill Avenue, Chicago police said.