A Monticello man and his 5-year-old grandson were killed after the tractor they were on rolled over in a steep ditch in Wright County Friday. 50-year-old Ron Gustafson and his grandson Rollie Gustafson died as a result of injuries sustained in the accident. Authorities say Ron Gustafson died at the scene. The grandson was taken to a Twin Cities hospital where he died Friday night. Ron Gustafson was reportedly in Clearwater to help build a fence at his brothers’ farm. The two went out for a ride after working on the fence when the accident happened.