A close relative of late spiritual Guru Sri Satya Sai Baba demanded CBI probe into his death saying his was not a natural death.

Spearing to reporters, the relative Ganapati Raju said that he had written letters to Chief Miniser Chandrababu Naidu and Prime Minister Narendra Modi seeking CBI probe in to Satya Sai Baba death.

"His death was not natural. It was a pre-planned hi-tech murder. I have some evidences to prove it. Hence, I sought CBI probe," he said, adding the killers of Sai Baba has the backing of some mysterious forces. Properties worth thousands of crores have changed hands, he alleged.

Ganapati Raju said he was attacked twice by unidentified persons for demanding CBI probe into Baba's death.