Hiroji Kondo, 60, an exorcist from Tochigi Prefecture who is suspected of killing a 7-year-old diabetic boy by persuading his parents to discontinue insulin injections, has confessed to conducting exorcisms for over a decade, police said.

Kondo, from the town of Shimotsuke in Tochigi Prefecture, was arrested Thursday for allegedly instructing the parents of insulin-dependent Shun Imai, a second grader at an Utsunomiya elementary school, to stop giving him insulin despite knowing he was highly likely to die without it.

Kondo denied causing the boy's death, police said.