Boston ? The family of a woman killed when the ceiling of a Big Dig tunnel collapsed on her car last year has agreed to a $6 million settlement with the company that supplied the epoxy blamed for the accident, an attorney said Monday.

Milena Del Valle, 39, was killed July 10, 2006, as she and her husband drove through an Interstate 90 connector tunnel. Her husband, Angel Del Valle, escaped with minor injuries.

Investigators determined that the ceiling collapsed because workers secured the ceiling with a fast-drying epoxy that was not safe to use for overhead loads.

Powers Fasteners Inc., a Brewster, N.Y., company that supplied the epoxy, has agreed to pay Del Valle’s family $6 million to settle a lawsuit the family filed in August 2006, said attorney Raipher Pellegrino, who represented the widower.

The company, one of 15 Big Dig contractors and agencies sued by Del Valle’s family, did not acknowledge wrongdoing in the settlement, which capped weeks of negotiations, Pellegrino said.