Helmut Jahn, Famed Chicago Architect, Dies in Bicycle Crash Aged 81—Tributes Paid On 5/10/21 at 4:06 AM EDT Helmut Jahn, the famed German-born American architect, has died after his bicycle was hit by two vehicles in Illinois. Jahn, 81, was struck on Saturday afternoon while riding on a street on Campton Hills, a suburb around 55 miles west of Chicago. According to Campton Hills Police Chief Steven Miller, Jahn apparently rode through a stop sign at an intersection and was hit by the two vehicles traveling in the opposite direction. Jahn was pronounced dead at the scene. The driver of one of the vehicles was taken to a hospital with non-life threatening injuries, reported ABC 7.