Hyogo prefectural police said Yoshitane Yamasaki was arrested on Saturday and handed over to prosecutors on Monday for further investigation.
Yamasaki acknowledged to police that he had kept his son, now 42, in the cage inside a hut next to his home in Hyogo prefecture in western Japan until January, when he turned himself in to city officials. He was seeking advice on nursing care for his wife, but revealed what he had done to his son, police said.
The officials visited his home and found the son sitting on a toilet sheet for pets inside the cage, which was slightly bigger than a coffin. He was exposed from the waist down, though Yamasaki told officials it wasn’t usually the case and that he had bathed and fed his son every other day.
Yamasaki told police he started confining his son when he became violent years…