Pret Atma, , on the account of eye witness it was Dipendra who has killed everybody. For me somebody like Gorkh Bahadur statment speaks volume. He has also lost his wife and this incidence has left his two children without mother. If i have to believe anybody I would rahter believe him. He has clearly said Dipendra killed his wife.  Also I believe the Durbar being such a big palace it would not have been possible to fake such a large incidence. There should be many people who would know the truth and it was not possible hide the truth.