Police said the victim, 20, was beaten on the 69th Street Red Line platform and found with cuts to his head at around 7:45 p.m. That's when he was rushed to the hospital.
A 15-year-old boy was later charged with attempted murder and aggravated battery, police said.
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It's still unclear what was happening in the moments leading up to this attack. Trains did bypass the 69th Street station for a couple hours as the investigation unfolded.
Police said two people of interest were taken into custody for questioning by detectives.
The video in the player above is from a previous report.
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