State police said 32-year-old Jared Ritchey, of Everett, died at the scene when a concrete manhole form fell on him. The accident happened about 2:10 p.m. Ritchey was formally pronounced dead about 90 minutes later.
Troopers from the Somerset barracks said Ritchey's co-workers worked to save him by having a crane lift off the concrete and by performing CPR before paramedics arrived.
Police didn't immediately identify the contracting company Ritchey was working for at the time.
The federal Occupational Safety and Health Administration is investigating, which is routine in workplace fatalities.