Attorney General Martha Coakley has appointed a special investigator to lead the criminal probe into the July big dig tunnel collapse.
Paul Ware, a partner at the law firm Goodwin Procter, will decide whether there is enough evidence to bring criminal charges.
Coakley previously said it could be extremely difficult to bring contractors up on criminal charges, a departure from former Attorney General Tom Reilly who called the collapse a crime.
This program aired on March 1, 2007. The audio for this program is not available.