By CBS 2 Chicago Staff

CHICAGO (CBS)– A death investigation is underway after a man was found unresponsive on a CTA Red Line platform in Old Town Tuesday morning.

Police said the 27-year-old man was found at the station at Clark and Division streets around 5 a.m.

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A witness attempted CPR until first responders arrived. The man was then pronounced dead on the scene.

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CTA Red Line trains bypassed the Clark/Division stop until about 8:30 a.m.

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This is a developing story. 

CBS 2 Chicago Staff