This is the confirmation made by the Japan Government on Netaji's death 60 years back. Those important documents are out now. Those documents reveal that Bose died in plane crash on 18th August, 1945. The documents are available on the website bosefiles.info Everyone can access these files. All the details regarding plane crash are explained in these documents.
The Taiwan plane in which Bose was travelling met with an accident due to internal problem.The plane hit a rock hill.The plane was set on fire due to this.Bose jumped out of the plane but major part of his body was burnt. He was taken to the hospital but was not survived by the treatment. You can refer Bosefiles.info for more details on Bose murder mystery.