Abstract: At approximately 12:30 p.m. on June 4, 1986, the employer and Employee #1 were removing trusses from a building under demolition. Plywood on the roof and the members supporting each truss had been removed. A four-inch by four-inch timber on four foot centers had also been removed. The employer used a forklift to take down several of the two-foot by 8-foot trusses. He then bumped the remaining trusses causing a domino effect which brought the remaining trusses down. Employee #1, who was clearing debris, noticed the trusses falling and ran for the door. Employee #1 was hit on the head by a truss before reaching the door. Emergency services were summoned. Employee #1 was transported to the hospital by helicopter where he was diagnosed with a fractured skull.