WASHINGTON - The man who led Equifax for 12 years before stepping down last week is scheduled to testify before a congressional committee on Tuesday to explain the massive data hack that hit the credit bureau earlier this year. 

Richard E. Smith is expected to explain how 145.5 million customers' personal and financial information was exposed in one of the largest corporate hacks in history. Smith will say he is "deeply sorry," according to prepared remarks released Monday.

How to watch the Equifax ex-CEO testimony:

Follow the live blog on www.cbsnews.com, and watch the testimony live at the House Energy and Commerce Committee's website.

Tuesday kicks off what is likely to be an apology tour for Smith. After testifying before the House Energy and Commerce Committee, he's scheduled to appear before the Senate Banking Committee on Wednesday and at the House Financial Services Committee the following data.