It happened around 8:15 p.m. near the Martin Luther King Jr. Boulevard Drive exit on I-90/SR-2 eastbound.
Firefighters had been called to the scene for a vehicle that had crashed and rolled over.
The hit firefighter, who is a veteran of the department, went to University Hospitals in critical condition, Cleveland police confirmed.
A vehicle reportedly struck him in the high speed lane. The driver of the vehicle then took off from the scene, multiple sources told the I-Team.
Cleveland police are asking that anyone who may have seen the suspected vehicle, a “white Chevy Malibu with front end damage,” to call 911 immediately.
The highway was closed near the scene after 11 p.m., Ohio Department of Transportation reported.
No further information has been released at this time. Check back for updates on this developing story.