GM CEO Mary Barra Testifies At Senate Hearing On GM Recall
Mary Theresa Ruddy, right, and her husband Leo Ruddy hold a photo of their daughter Kelly Erin Ruddy, who was 21 when she died in a car accident in 2010 involving her 2005 Chevy Cobalt, as General Motors CEO Mary Barra testifies before the Senate Commerce, Science and Transportation Committee on Capitol Hill, April 2, 2014 in Washington, DC.
Mark Wilson—Getty Images

Documents released by the House Oversight Committee show the engineer who designed the faulty ignition switch at the heart of the GM recall of 2.6 million cars in February had approved fixes to the system eight years ago without changing the part number