Deadly Bridge Collapse on I-75 in Cincinnati, Ohio

One construction worker killed when an overpass crumbled, sending tons of concrete falling on a highway below.
1:47 | 01/21/15

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Transcript for Deadly Bridge Collapse on I-75 in Cincinnati, Ohio
We move onto that deadly bridge collapse in Ohio. A construction worker killed, a truck driver injured when the overpass in Ohio crumbled onto the highway below. Concrete plunging in an instant. ABC's Alex Perez on the investigation and the questions about America's aging highways tonight. Reporter: Tense moments overnight along I-75 in Cincinnati. Report of an overpass at hopple street collapsing. Reporter: Tons of concrete and machinery plummeting onto the highway after this overpass collapsed. Looks like we have a dismantled overpass collapsed down onto a semitractor trailer here. Reporter: It was just after 10:30 Monday night. The overpass was being demolished as part of a highway widening project when it somehow gave way, pancaking onto the highway below. A semitruck driving under the overpass crashing into the scrumabling concrete. That driver miraculously surviving, just minor injuries. But a construction worker, 35-year-old Brandon Carl, was killed. Carl, a father of four, was engaged. Authorities now working to figure out how an ordinary demolition turned deadly. It's a routine operation. For the most part. We've done it on other projects. So, it was a simple demolition. Reporter: Federal records show the overpass was in "Decent shape," and was rated an 86 o4 out of 100 after its last inspection in 2011. But a 2013 report found more than 66,000 deficient bridges across the country. Traffic along this section of I-75 now halted, as crews work to clean up the scene. And at this point it's unclear when exactly this stretch of I-75 may reopen. Authorities say they are very lucky this did not happen during the rush hour when more people could have been hurt. David?

This transcript has been automatically generated and may not be 100% accurate.

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