New Jersey State Police say one person is dead after a semi-truck crashed into a pickup truck that was on the shoulder of a state highway in Mercer County. The accident was reported around 12:44 a.m. Saturday in the area of milepost .6 on Route 29 in Hamilton Township, authorities said. Police say the driver of a Chevrolet GMT-400 died after a Freightliner M2 traveling south struck the left rear of the pickup truck as it sat on the right shoulder. After the collision, the Chevrolet caught fire and became fully engulfed. The driver of the Chevrolet — whose identity had not been released as of S…