Akira Furusho, 40, was found collapsed and bleeding from the neck in a cage by a colleague after the Hirakawa Zoological Park closed for the day at 5 p.m.
Furusho was rushed to a hospital but was later pronounced dead. According to a preliminary investigation, he was attacked and killed by a five-year-old male tiger named Riku, who measures 1.8-meters (six-feet) long and weighs 170kg (375 pounds).
White tigers are Bengal tigers, not albinos or a separate subspecies, just the product of recessive genes.
Police are now investigating how the zoo looks after its white tigers, Japan's Kyodo news agency said. "We had been looking forward to seeing white tigers, so it is too bad".
Park chief Santos Kumar said: "The victim was assisting the caretaker in pushing the cats into their enclosure for the night when they turned around and pounced on him as one of the four gates was not shut and latched by then".
A source at the Bannerghatta Biological Park zoo on the outskirts of Bangalore, India, said: "It's a practice to feed tigers after the safaris are over around 5pm".
It was open Tuesday but the area around the tigers' display cage was restricted.
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