State police continue to investigate an incident that resulted in the death of William F. McGuigan while he was conducting maintenance work along the Pennsylvania Turnpike in Chester County Sunday morning, officials said.

The deadly incident involving McGuigan occurred in West Pikeland Township, Chester County, shortly after 8 a.m. on the westbound PA Turnpike at milepost 314, about two miles east of the Downingtown Interchange.

Turnpike crews had earlier closed the westbound right lane between mileposts 314 and 316 for required maintenance work; a tractor trailer apparently entered the closed lane, striking two employees, according to a release from the Pennsylvania Turnpike Commission. The other Turnpike employee, Maintenance Foreman Steve Rudzik, sustained minor injuries and was treated and released from Paoli Hospital.

McGuigan, 61, of Ardsley, Pa., was an equipment operator employed by the commission. He joined the Turnpike in April 2005.

Turnpike Chairman William K. Lieberman said he and the other Turnpike commissioners were deeply saddened by the tragedy.

"On behalf of my fellow Turnpike commissioners and CEO Mark Compton, I join Gov. Corbett in offering our sincerest condolences to Bill's family, friends and coworkers in this time of sorrow," Lieberman said. "Such a tragedy underscores the importance of exercising extreme caution when driving through any highway maintenance or construction zone."

The driver of the commercial truck was also transported by EMS to a local hospital.