When 49-year-old Richard White left San Diego early last week, he was embarking on the adventure of a lifetime. He went on a solo hiking trip in Alaska's vast and wild Denali National Park.However, things went wrong last Friday when White was taking pictures of a 600-pound grizzly. Park rangers said the photos show White within 50-yards of the bear. Park rules dictate that hikers stay at least a quarter of a mile away."To hear him portrayed as something of a nutcase or at least a careless person is really beyond acceptance," said White's father, Byron, during an interview with "Inside Edition."White had to watch a video on bear safety before being given a permit to enter Denali National Park.Byron White said accusations that his son got way too close to the grizzly bear do not add up.White was a scientist and his father said he dedicated his life to helping others. White did volunteer work for the charity Doctors Without Borders, which treats people in Third World countries."I would like his legacy to be one of his accomplishments and his aspirations because he was still a young man and I'm sure he would have gone on to greater things," said Byron White.A 220-square-mile area of Denali National Park where White was killed remains closed while investigators work to figure out exactly what happened to him. The bear that attacked him was later killed by park rangers.