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ST. CLAIR COUNTY • An Illinois man was impaired by a tranquilizer, a sleep aid and an antihistamine when he crashed his car into a construction zone on Interstate 64 in May and killed a worker, prosecutors say.

Prosecutors today charged Michael Jeter, 34, of West Frankfort, with four counts of aggravated driving under the influence.

Jeter drove his Honda into the back of a road striping machine along eastbound I-64 near the line between Fairview Heights and O'Fallon about 9:30 a.m. on May 22.

The workers were employed by Briteway Striping Services. Dennis Beard, 38, of Pocahontas, was killed. Three other workers, Brian Moore, Adam Evans and Kory Links, who were standing atop a cushioned barrier on the back of the machine when they were struck suffered serious injuries but survived.

Jeter was also seriously injured.

A witness to the crash told police Jeter was driving erratically and appeared confused after the crash.

Bail for Jeter was set at $750,000.