ZUMBRO FALLS, Minn. – The father-son relations that preceded a fatal attack Friday were strained, the mother told investigators. According to court documents, the mother said the son, James Riley, 44, had threatened to kill the father before. Indeed the son confessed to the deed Friday after the father’s body was found hidden in a car trunk. The father was killed while the mother was in town shopping. She discovered the crime when she came home
