Anderson , 53 , was married with two sons and a daughter . NEW : `` It was just a Yosemite accident , '' sister-in-law says . NEW : Anderson , annually , falls about 350 feet off the South Rim . He was visiting with his family from Yosemite . The National Park Service and a medical examiner are investigating .
NEW : `` It was just a Yosemite accident , '' sister-in-law says . NEW : Anderson , annually , falls about 350 feet off the South Rim . He was visiting with his family from Yosemite . The National Park Service and a medical examiner are investigating .