Tevita Mafi Filo, 25, was suffering from a “complex delusional system” when he attacked jogger Joanne Pert on January 7 in Remuera.
Kaniva News reports local residents found the body of the 41-year-old on their lawn about 11am.
A suppression order has prevented publication of how Pert died.
Filo will be detained indefinitely as a special patient at the Mason Clinic, a secure psychiatric unit.
He has schizophrenia and also suffers from end stage renal failure and completes dialysis three times a week.
