( CNN ) -- Ryan Kelly Chamberlain II , 42 , was last seen Saturday south of San Francisco . The body has not been found, but the family is concerned that he may have fallen into a creek or river. `` We do n't know the intent or motive yet , '' an agent tells reporters .
Ryan Kelly Chamberlain II , 42 , was last seen Saturday south of San Francisco . The body has not been found, but the family is concerned that he may have fallen into a creek or river. `` We do n't know the intent or motive yet , '' an agent tells reporters .